131920731 has 20 divisors (see below), whose sum is σ = 208661112. Its totient is φ = 82772928.

The previous prime is 131920729. The next prime is 131920741. The reversal of 131920731 is 137029131.

It is not a de Polignac number, because 131920731 - 2¹ = 131920729 is a prime.

It is a super-2 number, since 2×131920731² = 34806158535148722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 131920695 and 131920704.

It is not an unprimeable number, because it can be changed into a prime (131920721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 46525 + ... + 49278.

Almost surely, 2^131920731 is an apocalyptic number.

131920731 is a deficient number, since it is larger than the sum of its proper divisors (76740381).

131920731 is an equidigital number, since it uses as much as digits as its factorization.

131920731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95832 (or 95823 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 27.

The square root of 131920731 is about 11485.6750345811. The cubic root of 131920731 is about 509.0623949716.

Adding to 131920731 its reverse (137029131), we get a palindrome (268949862).

It can be divided in two parts, 131920 and 731, that added together give a cube (132651 = 51³).

The spelling of 131920731 in words is "one hundred thirty-one million, nine hundred twenty thousand, seven hundred thirty-one".