50997391897 has 2 divisors, whose sum is σ = 50997391898. Its totient is φ = 50997391896.

The previous prime is 50997391871. The next prime is 50997391919. The reversal of 50997391897 is 79819379905.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47840188176 + 3157203721 = 218724^2 + 56189^2 .

It is a cyclic number.

It is not a de Polignac number, because 50997391897 - 2¹⁵ = 50997359129 is a prime.

It is not a weakly prime, because it can be changed into another prime (50997391817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25498695948 + 25498695949.

It is an arithmetic number, because the mean of its divisors is an integer number (25498695949).

Almost surely, 2^50997391897 is an apocalyptic number.

It is an amenable number.

50997391897 is a deficient number, since it is larger than the sum of its proper divisors (1).

50997391897 is an equidigital number, since it uses as much as digits as its factorization.

50997391897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38578680, while the sum is 67.

The spelling of 50997391897 in words is "fifty billion, nine hundred ninety-seven million, three hundred ninety-one thousand, eight hundred ninety-seven".