131555545 has 32 divisors (see below), whose sum is σ = 177914880. Its totient is φ = 92568000.

The previous prime is 131555509. The next prime is 131555549. The reversal of 131555545 is 545555131.

It is not a de Polignac number, because 131555545 - 2⁹ = 131555033 is a prime.

It is a super-2 number, since 2×131555545² = 34613722840494050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 131555545.

It is not an unprimeable number, because it can be changed into a prime (131555549) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 230110 + ... + 230680.

It is an arithmetic number, because the mean of its divisors is an integer number (5559840).

Almost surely, 2^131555545 is an apocalyptic number.

It is an amenable number.

131555545 is a deficient number, since it is larger than the sum of its proper divisors (46359335).

131555545 is a wasteful number, since it uses less digits than its factorization.

131555545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717.

The product of its digits is 37500, while the sum is 34.

The square root of 131555545 is about 11469.7665625766. The cubic root of 131555545 is about 508.5922281210.

The spelling of 131555545 in words is "one hundred thirty-one million, five hundred fifty-five thousand, five hundred forty-five".