131637231 has 60 divisors (see below), whose sum is σ = 222764360. Its totient is φ = 77623920.

The previous prime is 131637221. The next prime is 131637241. The reversal of 131637231 is 132736131.

131637231 is a `hidden beast` number, since 1 + 3 + 1 + 637 + 23 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (131637221) and next prime (131637241).

It is not a de Polignac number, because 131637231 - 2¹³ = 131629039 is a prime.

It is a super-2 number, since 2×131637231² = 34656721170694722, which contains 22 as substring.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131637195 and 131637204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131637221) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 3557745 + ... + 3557781.

Almost surely, 2^131637231 is an apocalyptic number.

131637231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

131637231 is a deficient number, since it is larger than the sum of its proper divisors (91127129).

131637231 is an frugal number, since it uses more digits than its factorization.

131637231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96 (or 51 counting only the distinct ones).

The product of its digits is 2268, while the sum is 27.

The square root of 131637231 is about 11473.3269368566. The cubic root of 131637231 is about 508.6974720542.

The spelling of 131637231 in words is "one hundred thirty-one million, six hundred thirty-seven thousand, two hundred thirty-one".