137368981 has 4 divisors (see below), whose sum is σ = 137437632. Its totient is φ = 137300332.

The previous prime is 137368963. The next prime is 137368997. The reversal of 137368981 is 189863731.

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, and also an emirpimes, since its reverse is a distinct semiprime: 189863731 = 797 ⋅238223.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-137368981 is a prime.

It is a super-2 number, since 2×137368981² = 37740473881956722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137368481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31231 + ... + 35356.

It is an arithmetic number, because the mean of its divisors is an integer number (34359408).

Almost surely, 2^137368981 is an apocalyptic number.

It is an amenable number.

137368981 is a deficient number, since it is larger than the sum of its proper divisors (68651).

137368981 is an equidigital number, since it uses as much as digits as its factorization.

137368981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68650.

The product of its digits is 217728, while the sum is 46.

The square root of 137368981 is about 11720.4513991569. The cubic root of 137368981 is about 515.9760682870.

The spelling of 137368981 in words is "one hundred thirty-seven million, three hundred sixty-eight thousand, nine hundred eighty-one".