137986831 has 2 divisors, whose sum is σ = 137986832. Its totient is φ = 137986830.

The previous prime is 137986813. The next prime is 137986883. The reversal of 137986831 is 138689731.

Together with previous prime (137986813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (138689731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 137986831 - 2¹⁷ = 137855759 is a prime.

It is a super-2 number, since 2×137986831² = 38080731058845122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137986631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68993415 + 68993416.

It is an arithmetic number, because the mean of its divisors is an integer number (68993416).

Almost surely, 2^137986831 is an apocalyptic number.

137986831 is a deficient number, since it is larger than the sum of its proper divisors (1).

137986831 is an equidigital number, since it uses as much as digits as its factorization.

137986831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 46.

The square root of 137986831 is about 11746.7796012354. The cubic root of 137986831 is about 516.7484868456.

The spelling of 137986831 in words is "one hundred thirty-seven million, nine hundred eighty-six thousand, eight hundred thirty-one".