137864691 has 12 divisors (see below), whose sum is σ = 207796368. Its totient is φ = 87913584.

The previous prime is 137864687. The next prime is 137864693. The reversal of 137864691 is 196468731.

It is a happy number.

It is not a de Polignac number, because 137864691 - 2² = 137864687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (137864693) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 332800 + ... + 333213.

It is an arithmetic number, because the mean of its divisors is an integer number (17316364).

Almost surely, 2^137864691 is an apocalyptic number.

137864691 is a deficient number, since it is larger than the sum of its proper divisors (69931677).

137864691 is a wasteful number, since it uses less digits than its factorization.

137864691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666042 (or 666039 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 137864691 is about 11741.5795785746. The cubic root of 137864691 is about 516.5959740024.

It can be divided in two parts, 1378 and 64691, that multiplied together give a palindrome (89144198).

The spelling of 137864691 in words is "one hundred thirty-seven million, eight hundred sixty-four thousand, six hundred ninety-one".