137678261 has 4 divisors (see below), whose sum is σ = 157346592. Its totient is φ = 118009932.

The previous prime is 137678213. The next prime is 137678263. The reversal of 137678261 is 162876731.

137678261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 137678261 - 2⁶ = 137678197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137678263) 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, 9834155 + ... + 9834168.

It is an arithmetic number, because the mean of its divisors is an integer number (39336648).

Almost surely, 2^137678261 is an apocalyptic number.

It is an amenable number.

137678261 is a deficient number, since it is larger than the sum of its proper divisors (19668331).

137678261 is an equidigital number, since it uses as much as digits as its factorization.

137678261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19668330.

The product of its digits is 84672, while the sum is 41.

The square root of 137678261 is about 11733.6380121427. The cubic root of 137678261 is about 516.3630102386.

The spelling of 137678261 in words is "one hundred thirty-seven million, six hundred seventy-eight thousand, two hundred sixty-one".