137220907 has 4 divisors (see below), whose sum is σ = 144443080. Its totient is φ = 129998736.

The previous prime is 137220899. The next prime is 137220913. The reversal of 137220907 is 709022731.

137220907 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 an emirpimes, since its reverse is a distinct semiprime: 709022731 = 31 ⋅22871701.

It is a cyclic number.

It is not a de Polignac number, because 137220907 - 2³ = 137220899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137220977) 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, 3611058 + ... + 3611095.

It is an arithmetic number, because the mean of its divisors is an integer number (36110770).

Almost surely, 2^137220907 is an apocalyptic number.

137220907 is a deficient number, since it is larger than the sum of its proper divisors (7222173).

137220907 is an equidigital number, since it uses as much as digits as its factorization.

137220907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7222172.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 137220907 is about 11714.1327890715. The cubic root of 137220907 is about 515.7906064541.

The spelling of 137220907 in words is "one hundred thirty-seven million, two hundred twenty thousand, nine hundred seven".