137500061 has 4 divisors (see below), whose sum is σ = 137580252. Its totient is φ = 137419872.

The previous prime is 137500037. The next prime is 137500123. The reversal of 137500061 is 160005731.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13734436 + 123765625 = 3706^2 + 11125^2 .

It is a cyclic number.

It is not a de Polignac number, because 137500061 - 2⁶ = 137499997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137500261) 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, 37466 + ... + 40971.

It is an arithmetic number, because the mean of its divisors is an integer number (34395063).

Almost surely, 2^137500061 is an apocalyptic number.

It is an amenable number.

137500061 is a deficient number, since it is larger than the sum of its proper divisors (80191).

137500061 is an equidigital number, since it uses as much as digits as its factorization.

137500061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80190.

The product of its (nonzero) digits is 630, while the sum is 23.

The square root of 137500061 is about 11726.0420006070. The cubic root of 137500061 is about 516.1401340543.

Adding to 137500061 its reverse (160005731), we get a palindrome (297505792).

The spelling of 137500061 in words is "one hundred thirty-seven million, five hundred thousand, sixty-one".