131621465 has 4 divisors (see below), whose sum is σ = 157945764. Its totient is φ = 105297168.

The previous prime is 131621437. The next prime is 131621471. The reversal of 131621465 is 564126131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71961289 + 59660176 = 8483^2 + 7724^2 .

It is a cyclic number.

It is not a de Polignac number, because 131621465 - 2¹⁰ = 131620441 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13162142 + ... + 13162151.

It is an arithmetic number, because the mean of its divisors is an integer number (39486441).

Almost surely, 2^131621465 is an apocalyptic number.

It is an amenable number.

131621465 is a deficient number, since it is larger than the sum of its proper divisors (26324299).

131621465 is an equidigital number, since it uses as much as digits as its factorization.

131621465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26324298.

The product of its digits is 4320, while the sum is 29.

The square root of 131621465 is about 11472.6398444299. The cubic root of 131621465 is about 508.6771625909.

Adding to 131621465 its reverse (564126131), we get a palindrome (695747596).

The spelling of 131621465 in words is "one hundred thirty-one million, six hundred twenty-one thousand, four hundred sixty-five".