137931091 has 8 divisors (see below), whose sum is σ = 141912464. Its totient is φ = 134006400.

The previous prime is 137931083. The next prime is 137931119. The reversal of 137931091 is 190139731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 137931091 - 2³ = 137931083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137931191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9210 + ... + 18991.

It is an arithmetic number, because the mean of its divisors is an integer number (17739058).

Almost surely, 2^137931091 is an apocalyptic number.

137931091 is a deficient number, since it is larger than the sum of its proper divisors (3981373).

137931091 is an equidigital number, since it uses as much as digits as its factorization.

137931091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28341.

The product of its (nonzero) digits is 5103, while the sum is 34.

The square root of 137931091 is about 11744.4067964287. The cubic root of 137931091 is about 516.6788970165.

It can be divided in two parts, 13793 and 1091, that added together give a square (14884 = 122²).

The spelling of 137931091 in words is "one hundred thirty-seven million, nine hundred thirty-one thousand, ninety-one".