131225645 has 18 divisors (see below), whose sum is σ = 162382122. Its totient is φ = 101804256.

The previous prime is 131225639. The next prime is 131225651. The reversal of 131225645 is 546522131.

It is an interprime number because it is at equal distance from previous prime (131225639) and next prime (131225651).

It can be written as a sum of positive squares in 3 ways, for example, as 32878756 + 98346889 = 5734^2 + 9917^2 .

It is not a de Polignac number, because 131225645 - 2⁶ = 131225581 is a prime.

It is a super-3 number, since 3×131225645³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1203851 + ... + 1203959.

It is an arithmetic number, because the mean of its divisors is an integer number (9021229).

Almost surely, 2^131225645 is an apocalyptic number.

It is an amenable number.

131225645 is a deficient number, since it is larger than the sum of its proper divisors (31156477).

131225645 is an frugal number, since it uses more digits than its factorization.

131225645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317 (or 161 counting only the distinct ones).

The product of its digits is 7200, while the sum is 29.

The square root of 131225645 is about 11455.3762487314. The cubic root of 131225645 is about 508.1667423889.

Adding to 131225645 its reverse (546522131), we get a palindrome (677747776).

The spelling of 131225645 in words is "one hundred thirty-one million, two hundred twenty-five thousand, six hundred forty-five".