137261439217 has 4 divisors (see below), whose sum is σ = 156870216256. Its totient is φ = 117652662180.

The previous prime is 137261439209. The next prime is 137261439277. The reversal of 137261439217 is 712934162731.

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 not a de Polignac number, because 137261439217 - 2³ = 137261439209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137261439277) 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, 9804388509 + ... + 9804388522.

It is an arithmetic number, because the mean of its divisors is an integer number (39217554064).

Almost surely, 2^137261439217 is an apocalyptic number.

It is an amenable number.

137261439217 is a deficient number, since it is larger than the sum of its proper divisors (19608777039).

137261439217 is an equidigital number, since it uses as much as digits as its factorization.

137261439217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19608777038.

The product of its digits is 381024, while the sum is 46.

The spelling of 137261439217 in words is "one hundred thirty-seven billion, two hundred sixty-one million, four hundred thirty-nine thousand, two hundred seventeen".