137816881 has 2 divisors, whose sum is σ = 137816882. Its totient is φ = 137816880.

The previous prime is 137816879. The next prime is 137816891. The reversal of 137816881 is 188618731.

137816881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86192656 + 51624225 = 9284^2 + 7185^2 .

It is a cyclic number.

It is not a de Polignac number, because 137816881 - 2¹ = 137816879 is a prime.

It is a super-2 number, since 2×137816881² = 37986985377136322, which contains 22 as substring.

Together with 137816879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (137816891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68908440 + 68908441.

It is an arithmetic number, because the mean of its divisors is an integer number (68908441).

Almost surely, 2^137816881 is an apocalyptic number.

It is an amenable number.

137816881 is a deficient number, since it is larger than the sum of its proper divisors (1).

137816881 is an equidigital number, since it uses as much as digits as its factorization.

137816881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 43.

The square root of 137816881 is about 11739.5434749397. The cubic root of 137816881 is about 516.5362504455.

The spelling of 137816881 in words is "one hundred thirty-seven million, eight hundred sixteen thousand, eight hundred eighty-one".