137405523 has 4 divisors (see below), whose sum is σ = 183207368. Its totient is φ = 91603680.

The previous prime is 137405503. The next prime is 137405533. The reversal of 137405523 is 325504731.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 137405523 - 2⁹ = 137405011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137405503) 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, 22900918 + ... + 22900923.

It is an arithmetic number, because the mean of its divisors is an integer number (45801842).

Almost surely, 2^137405523 is an apocalyptic number.

137405523 is a deficient number, since it is larger than the sum of its proper divisors (45801845).

137405523 is an equidigital number, since it uses as much as digits as its factorization.

137405523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45801844.

The product of its (nonzero) digits is 12600, while the sum is 30.

The square root of 137405523 is about 11722.0101945016. The cubic root of 137405523 is about 516.0218164263.

The spelling of 137405523 in words is "one hundred thirty-seven million, four hundred five thousand, five hundred twenty-three".