49797137861 has 2 divisors, whose sum is σ = 49797137862. Its totient is φ = 49797137860.

The previous prime is 49797137801. The next prime is 49797137909. The reversal of 49797137861 is 16873179794.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42994022500 + 6803115361 = 207350^2 + 82481^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-49797137861 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 49797137794 and 49797137803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49797137801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24898568930 + 24898568931.

It is an arithmetic number, because the mean of its divisors is an integer number (24898568931).

Almost surely, 2^49797137861 is an apocalyptic number.

It is an amenable number.

49797137861 is a deficient number, since it is larger than the sum of its proper divisors (1).

49797137861 is an equidigital number, since it uses as much as digits as its factorization.

49797137861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16003008, while the sum is 62.

The spelling of 49797137861 in words is "forty-nine billion, seven hundred ninety-seven million, one hundred thirty-seven thousand, eight hundred sixty-one".