137505215 has 4 divisors (see below), whose sum is σ = 165006264. Its totient is φ = 110004168.

The previous prime is 137505191. The next prime is 137505227. The reversal of 137505215 is 512505731.

It is a happy number.

137505215 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.

It is a cyclic number.

It is not a de Polignac number, because 137505215 - 2²² = 133310911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13750517 + ... + 13750526.

It is an arithmetic number, because the mean of its divisors is an integer number (41251566).

Almost surely, 2^137505215 is an apocalyptic number.

137505215 is a deficient number, since it is larger than the sum of its proper divisors (27501049).

137505215 is an equidigital number, since it uses as much as digits as its factorization.

137505215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27501048.

The product of its (nonzero) digits is 5250, while the sum is 29.

The square root of 137505215 is about 11726.2617657973. The cubic root of 137505215 is about 516.1465829073.

The spelling of 137505215 in words is "one hundred thirty-seven million, five hundred five thousand, two hundred fifteen".