131561403 has 16 divisors (see below), whose sum is σ = 185556480. Its totient is φ = 82741824.

The previous prime is 131561389. The next prime is 131561407. The reversal of 131561403 is 304165131.

It is not a de Polignac number, because 131561403 - 2⁴ = 131561387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131561407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8023 + ... + 18096.

It is an arithmetic number, because the mean of its divisors is an integer number (11597280).

Almost surely, 2^131561403 is an apocalyptic number.

131561403 is a deficient number, since it is larger than the sum of its proper divisors (53995077).

131561403 is a wasteful number, since it uses less digits than its factorization.

131561403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26218.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 131561403 is about 11470.0219267445. The cubic root of 131561403 is about 508.5997769959.

The spelling of 131561403 in words is "one hundred thirty-one million, five hundred sixty-one thousand, four hundred three".