131421637 has 2 divisors, whose sum is σ = 131421638. Its totient is φ = 131421636.

The previous prime is 131421623. The next prime is 131421671. The reversal of 131421637 is 736124131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130096836 + 1324801 = 11406^2 + 1151^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131421637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131421607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65710818 + 65710819.

It is an arithmetic number, because the mean of its divisors is an integer number (65710819).

Almost surely, 2^131421637 is an apocalyptic number.

It is an amenable number.

131421637 is a deficient number, since it is larger than the sum of its proper divisors (1).

131421637 is an equidigital number, since it uses as much as digits as its factorization.

131421637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 28.

The square root of 131421637 is about 11463.9276428282. The cubic root of 131421637 is about 508.4196072745.

Adding to 131421637 its reverse (736124131), we get a palindrome (867545768).

The spelling of 131421637 in words is "one hundred thirty-one million, four hundred twenty-one thousand, six hundred thirty-seven".