137898791 has 2 divisors, whose sum is σ = 137898792. Its totient is φ = 137898790.

The previous prime is 137898779. The next prime is 137898793. The reversal of 137898791 is 197898731.

It is a strong prime.

It is an emirp because it is prime and its reverse (197898731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 137898791 - 2¹⁸ = 137636647 is a prime.

Together with 137898793, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137898793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68949395 + 68949396.

It is an arithmetic number, because the mean of its divisors is an integer number (68949396).

Almost surely, 2^137898791 is an apocalyptic number.

137898791 is a deficient number, since it is larger than the sum of its proper divisors (1).

137898791 is an equidigital number, since it uses as much as digits as its factorization.

137898791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 53.

The square root of 137898791 is about 11743.0315932471. The cubic root of 137898791 is about 516.6385627909.

The spelling of 137898791 in words is "one hundred thirty-seven million, eight hundred ninety-eight thousand, seven hundred ninety-one".