52120137991 has 2 divisors, whose sum is σ = 52120137992. Its totient is φ = 52120137990.

The previous prime is 52120137947. The next prime is 52120138009. The reversal of 52120137991 is 19973102125.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 52120137991 - 2⁷ = 52120137863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52120137911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26060068995 + 26060068996.

It is an arithmetic number, because the mean of its divisors is an integer number (26060068996).

Almost surely, 2^52120137991 is an apocalyptic number.

52120137991 is a deficient number, since it is larger than the sum of its proper divisors (1).

52120137991 is an equidigital number, since it uses as much as digits as its factorization.

52120137991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 40.

The spelling of 52120137991 in words is "fifty-two billion, one hundred twenty million, one hundred thirty-seven thousand, nine hundred ninety-one".