137512501261 has 4 divisors (see below), whose sum is σ = 137895544800. Its totient is φ = 137129457724.

The previous prime is 137512501211. The next prime is 137512501277. The reversal of 137512501261 is 162105215731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-137512501261 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 (137512501201) 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, 191521231 + ... + 191521948.

It is an arithmetic number, because the mean of its divisors is an integer number (34473886200).

Almost surely, 2^137512501261 is an apocalyptic number.

It is an amenable number.

137512501261 is a deficient number, since it is larger than the sum of its proper divisors (383043539).

137512501261 is an equidigital number, since it uses as much as digits as its factorization.

137512501261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383043538.

The product of its (nonzero) digits is 12600, while the sum is 34.

Adding to 137512501261 its reverse (162105215731), we get a palindrome (299617716992).

The spelling of 137512501261 in words is "one hundred thirty-seven billion, five hundred twelve million, five hundred one thousand, two hundred sixty-one".