611172278491 has 2 divisors, whose sum is σ = 611172278492. Its totient is φ = 611172278490.

The previous prime is 611172278473. The next prime is 611172278533. The reversal of 611172278491 is 194872271116.

611172278491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 611172278491 - 2²³ = 611163889883 is a prime.

It is a super-2 number, since 2×611172278491² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (611172578491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305586139245 + 305586139246.

It is an arithmetic number, because the mean of its divisors is an integer number (305586139246).

Almost surely, 2^611172278491 is an apocalyptic number.

611172278491 is a deficient number, since it is larger than the sum of its proper divisors (1).

611172278491 is an equidigital number, since it uses as much as digits as its factorization.

611172278491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 49.

The spelling of 611172278491 in words is "six hundred eleven billion, one hundred seventy-two million, two hundred seventy-eight thousand, four hundred ninety-one".