137971215 has 32 divisors (see below), whose sum is σ = 246435840. Its totient is φ = 73238688.

The previous prime is 137971213. The next prime is 137971259. The reversal of 137971215 is 512179731.

137971215 is a `hidden beast` number, since 1 + 379 + 71 + 215 = 666.

It is not a de Polignac number, because 137971215 - 2¹ = 137971213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 137971215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137971213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27814 + ... + 32396.

It is an arithmetic number, because the mean of its divisors is an integer number (7701120).

Almost surely, 2^137971215 is an apocalyptic number.

137971215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

137971215 is a deficient number, since it is larger than the sum of its proper divisors (108464625).

137971215 is a wasteful number, since it uses less digits than its factorization.

137971215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4820 (or 4814 counting only the distinct ones).

The product of its digits is 13230, while the sum is 36.

The square root of 137971215 is about 11746.1148896135. The cubic root of 137971215 is about 516.7289925969.

The spelling of 137971215 in words is "one hundred thirty-seven million, nine hundred seventy-one thousand, two hundred fifteen".