61305684091 has 2 divisors, whose sum is σ = 61305684092. Its totient is φ = 61305684090.

The previous prime is 61305684049. The next prime is 61305684169. The reversal of 61305684091 is 19048650316.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61305684091 - 2¹⁷ = 61305553019 is a prime.

It is not a weakly prime, because it can be changed into another prime (61305684491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30652842045 + 30652842046.

It is an arithmetic number, because the mean of its divisors is an integer number (30652842046).

Almost surely, 2^61305684091 is an apocalyptic number.

61305684091 is a deficient number, since it is larger than the sum of its proper divisors (1).

61305684091 is an equidigital number, since it uses as much as digits as its factorization.

61305684091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 61305684091 in words is "sixty-one billion, three hundred five million, six hundred eighty-four thousand, ninety-one".