131421625 has 8 divisors (see below), whose sum is σ = 164014344. Its totient is φ = 105137200.

The previous prime is 131421623. The next prime is 131421637. The reversal of 131421625 is 526124131.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1279161 + 130142464 = 1131^2 + 11408^2 .

It is not a de Polignac number, because 131421625 - 2¹ = 131421623 is a prime.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131421625.

It is not an unprimeable number, because it can be changed into a prime (131421623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 525562 + ... + 525811.

It is an arithmetic number, because the mean of its divisors is an integer number (20501793).

Almost surely, 2^131421625 is an apocalyptic number.

It is an amenable number.

131421625 is a deficient number, since it is larger than the sum of its proper divisors (32592719).

131421625 is an equidigital number, since it uses as much as digits as its factorization.

131421625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051388 (or 1051378 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 131421625 is about 11463.9271194473. The cubic root of 131421625 is about 508.4195918000.

Adding to 131421625 its reverse (526124131), we get a palindrome (657545756).

The spelling of 131421625 in words is "one hundred thirty-one million, four hundred twenty-one thousand, six hundred twenty-five".