61351111117 has 2 divisors, whose sum is σ = 61351111118. Its totient is φ = 61351111116.

The previous prime is 61351111111. The next prime is 61351111201. The reversal of 61351111117 is 71111115316.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56429527401 + 4921583716 = 237549^2 + 70154^2 .

It is a cyclic number.

It is not a de Polignac number, because 61351111117 - 2²³ = 61342722509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61351111111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30675555558 + 30675555559.

It is an arithmetic number, because the mean of its divisors is an integer number (30675555559).

Almost surely, 2^61351111117 is an apocalyptic number.

It is an amenable number.

61351111117 is a deficient number, since it is larger than the sum of its proper divisors (1).

61351111117 is an equidigital number, since it uses as much as digits as its factorization.

61351111117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 630, while the sum is 28.

The spelling of 61351111117 in words is "sixty-one billion, three hundred fifty-one million, one hundred eleven thousand, one hundred seventeen".