131225615 has 16 divisors (see below), whose sum is σ = 161064288. Its totient is φ = 102600576.

The previous prime is 131225593. The next prime is 131225639. The reversal of 131225615 is 516522131.

It is a cyclic number.

It is not a de Polignac number, because 131225615 - 2⁸ = 131225359 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 80549 + ... + 82161.

It is an arithmetic number, because the mean of its divisors is an integer number (10066518).

Almost surely, 2^131225615 is an apocalyptic number.

131225615 is a deficient number, since it is larger than the sum of its proper divisors (29838673).

131225615 is a wasteful number, since it uses less digits than its factorization.

131225615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1978.

The product of its digits is 1800, while the sum is 26.

The square root of 131225615 is about 11455.3749393025. The cubic root of 131225615 is about 508.1667036643.

Adding to 131225615 its reverse (516522131), we get a palindrome (647747746).

The spelling of 131225615 in words is "one hundred thirty-one million, two hundred twenty-five thousand, six hundred fifteen".