137619681 has 4 divisors (see below), whose sum is σ = 183492912. Its totient is φ = 91746452.

The previous prime is 137619667. The next prime is 137619689. The reversal of 137619681 is 186916731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 137619681 - 2⁶ = 137619617 is a prime.

It is a super-2 number, since 2×137619681² = 37878353197083522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (137619689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22936611 + ... + 22936616.

It is an arithmetic number, because the mean of its divisors is an integer number (45873228).

Almost surely, 2^137619681 is an apocalyptic number.

It is an amenable number.

137619681 is a deficient number, since it is larger than the sum of its proper divisors (45873231).

137619681 is an equidigital number, since it uses as much as digits as its factorization.

137619681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45873230.

The product of its digits is 54432, while the sum is 42.

The square root of 137619681 is about 11731.1415045596. The cubic root of 137619681 is about 516.2897649878.

The spelling of 137619681 in words is "one hundred thirty-seven million, six hundred nineteen thousand, six hundred eighty-one".