137172962981 has 4 divisors (see below), whose sum is σ = 137236677612. Its totient is φ = 137109248352.

The previous prime is 137172962933. The next prime is 137172962999. The reversal of 137172962981 is 189269271731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 189269271731 = 131 ⋅1444803601.

It can be written as a sum of positive squares in 2 ways, for example, as 45639485956 + 91533477025 = 213634^2 + 302545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-137172962981 is a prime.

It is a super-2 number, since 2×137172962981² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137172962281) 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, 31854086 + ... + 31858391.

It is an arithmetic number, because the mean of its divisors is an integer number (34309169403).

Almost surely, 2^137172962981 is an apocalyptic number.

It is an amenable number.

137172962981 is a deficient number, since it is larger than the sum of its proper divisors (63714631).

137172962981 is an equidigital number, since it uses as much as digits as its factorization.

137172962981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63714630.

The product of its digits is 2286144, while the sum is 56.

The spelling of 137172962981 in words is "one hundred thirty-seven billion, one hundred seventy-two million, nine hundred sixty-two thousand, nine hundred eighty-one".