61195874891 has 2 divisors, whose sum is σ = 61195874892. Its totient is φ = 61195874890.

The previous prime is 61195874881. The next prime is 61195874893. The reversal of 61195874891 is 19847859116.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61195874891 - 2²² = 61191680587 is a prime.

Together with 61195874893, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61195874891.

It is not a weakly prime, because it can be changed into another prime (61195874893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30597937445 + 30597937446.

It is an arithmetic number, because the mean of its divisors is an integer number (30597937446).

Almost surely, 2^61195874891 is an apocalyptic number.

61195874891 is a deficient number, since it is larger than the sum of its proper divisors (1).

61195874891 is an equidigital number, since it uses as much as digits as its factorization.

61195874891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 59.

The spelling of 61195874891 in words is "sixty-one billion, one hundred ninety-five million, eight hundred seventy-four thousand, eight hundred ninety-one".