137720045 has 4 divisors (see below), whose sum is σ = 165264060. Its totient is φ = 110176032.

The previous prime is 137720039. The next prime is 137720059. The reversal of 137720045 is 540027731.

137720045 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: 540027731 = 419 ⋅1288849.

It can be written as a sum of positive squares in 2 ways, for example, as 45981961 + 91738084 = 6781^2 + 9578^2 .

It is a cyclic number.

It is not a de Polignac number, because 137720045 - 2⁴ = 137720029 is a prime.

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, 13772000 + ... + 13772009.

It is an arithmetic number, because the mean of its divisors is an integer number (41316015).

Almost surely, 2^137720045 is an apocalyptic number.

It is an amenable number.

137720045 is a deficient number, since it is larger than the sum of its proper divisors (27544015).

137720045 is an equidigital number, since it uses as much as digits as its factorization.

137720045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27544014.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 137720045 is about 11735.4183990176. The cubic root of 137720045 is about 516.4152419890.

Adding to 137720045 its reverse (540027731), we get a palindrome (677747776).

The spelling of 137720045 in words is "one hundred thirty-seven million, seven hundred twenty thousand, forty-five".