131513237 has 2 divisors, whose sum is σ = 131513238. Its totient is φ = 131513236.

The previous prime is 131513233. The next prime is 131513257. The reversal of 131513237 is 732315131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81018001 + 50495236 = 9001^2 + 7106^2 .

It is a cyclic number.

It is not a de Polignac number, because 131513237 - 2² = 131513233 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131513233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65756618 + 65756619.

It is an arithmetic number, because the mean of its divisors is an integer number (65756619).

Almost surely, 2^131513237 is an apocalyptic number.

It is an amenable number.

131513237 is a deficient number, since it is larger than the sum of its proper divisors (1).

131513237 is an equidigital number, since it uses as much as digits as its factorization.

131513237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1890, while the sum is 26.

The square root of 131513237 is about 11467.9220872833. The cubic root of 131513237 is about 508.5377015278.

Adding to 131513237 its reverse (732315131), we get a palindrome (863828368).

The spelling of 131513237 in words is "one hundred thirty-one million, five hundred thirteen thousand, two hundred thirty-seven".