131225731 has 16 divisors (see below), whose sum is σ = 163926784. Its totient is φ = 102272544.

The previous prime is 131225711. The next prime is 131225747. The reversal of 131225731 is 137522131.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 131225731 - 2¹⁹ = 130701443 is a prime.

It is a super-2 number, since 2×131225731² = 34440384952968722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 131225696 and 131225705.

It is not an unprimeable number, because it can be changed into a prime (131225711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4665 + ... + 16858.

It is an arithmetic number, because the mean of its divisors is an integer number (10245424).

Almost surely, 2^131225731 is an apocalyptic number.

131225731 is a deficient number, since it is larger than the sum of its proper divisors (32701053).

131225731 is a wasteful number, since it uses less digits than its factorization.

131225731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21610.

The product of its digits is 1260, while the sum is 25.

The square root of 131225731 is about 11455.3800024268. The cubic root of 131225731 is about 508.1668533996.

Adding to 131225731 its reverse (137522131), we get a palindrome (268747862).

The spelling of 131225731 in words is "one hundred thirty-one million, two hundred twenty-five thousand, seven hundred thirty-one".