137564881 has 4 divisors (see below), whose sum is σ = 140920164. Its totient is φ = 134209600.

The previous prime is 137564879. The next prime is 137564891. The reversal of 137564881 is 188465731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 188465731 = 19 ⋅9919249.

It can be written as a sum of positive squares in 2 ways, for example, as 76475025 + 61089856 = 8745^2 + 7816^2 .

It is a cyclic number.

It is not a de Polignac number, because 137564881 - 2¹ = 137564879 is a prime.

It is a super-2 number, since 2×137564881² = 37848192969088322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137564891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1677580 + ... + 1677661.

It is an arithmetic number, because the mean of its divisors is an integer number (35230041).

Almost surely, 2^137564881 is an apocalyptic number.

It is an amenable number.

137564881 is a deficient number, since it is larger than the sum of its proper divisors (3355283).

137564881 is an equidigital number, since it uses as much as digits as its factorization.

137564881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3355282.

The product of its digits is 161280, while the sum is 43.

The square root of 137564881 is about 11728.8056084155. The cubic root of 137564881 is about 516.2212272246.

The spelling of 137564881 in words is "one hundred thirty-seven million, five hundred sixty-four thousand, eight hundred eighty-one".