611972591 has 2 divisors, whose sum is σ = 611972592. Its totient is φ = 611972590.

The previous prime is 611972549. The next prime is 611972593. The reversal of 611972591 is 195279116.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 611972591 - 2²² = 607778287 is a prime.

Together with 611972593, 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 (611972593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305986295 + 305986296.

It is an arithmetic number, because the mean of its divisors is an integer number (305986296).

Almost surely, 2^611972591 is an apocalyptic number.

611972591 is a deficient number, since it is larger than the sum of its proper divisors (1).

611972591 is an equidigital number, since it uses as much as digits as its factorization.

611972591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34020, while the sum is 41.

The square root of 611972591 is about 24738.0797759244. The cubic root of 611972591 is about 849.0057999893.

The spelling of 611972591 in words is "six hundred eleven million, nine hundred seventy-two thousand, five hundred ninety-one".