61297269791 has 2 divisors, whose sum is σ = 61297269792. Its totient is φ = 61297269790.

The previous prime is 61297269749. The next prime is 61297269797. The reversal of 61297269791 is 19796279216.

61297269791 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61297269791 - 2³⁰ = 60223527967 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61297269791.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61297269797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30648634895 + 30648634896.

It is an arithmetic number, because the mean of its divisors is an integer number (30648634896).

Almost surely, 2^61297269791 is an apocalyptic number.

61297269791 is a deficient number, since it is larger than the sum of its proper divisors (1).

61297269791 is an equidigital number, since it uses as much as digits as its factorization.

61297269791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5143824, while the sum is 59.

The spelling of 61297269791 in words is "sixty-one billion, two hundred ninety-seven million, two hundred sixty-nine thousand, seven hundred ninety-one".