137611681 has 2 divisors, whose sum is σ = 137611682. Its totient is φ = 137611680.

The previous prime is 137611673. The next prime is 137611741. The reversal of 137611681 is 186116731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120670225 + 16941456 = 10985^2 + 4116^2 .

It is a cyclic number.

It is not a de Polignac number, because 137611681 - 2³ = 137611673 is a prime.

It is a super-2 number, since 2×137611681² = 37873949495291522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (137611631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68805840 + 68805841.

It is an arithmetic number, because the mean of its divisors is an integer number (68805841).

Almost surely, 2^137611681 is an apocalyptic number.

It is an amenable number.

137611681 is a deficient number, since it is larger than the sum of its proper divisors (1).

137611681 is an equidigital number, since it uses as much as digits as its factorization.

137611681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 34.

The square root of 137611681 is about 11730.8005268183. The cubic root of 137611681 is about 516.2797606093.

The spelling of 137611681 in words is "one hundred thirty-seven million, six hundred eleven thousand, six hundred eighty-one".