61915901 has 2 divisors, whose sum is σ = 61915902. Its totient is φ = 61915900.

The previous prime is 61915877. The next prime is 61915939. The reversal of 61915901 is 10951916.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53071225 + 8844676 = 7285^2 + 2974^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61915901 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61915991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30957950 + 30957951.

It is an arithmetic number, because the mean of its divisors is an integer number (30957951).

Almost surely, 2^61915901 is an apocalyptic number.

It is an amenable number.

61915901 is a deficient number, since it is larger than the sum of its proper divisors (1).

61915901 is an equidigital number, since it uses as much as digits as its factorization.

61915901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2430, while the sum is 32.

The square root of 61915901 is about 7868.6657700019. The cubic root of 61915901 is about 395.6101258397.

The spelling of 61915901 in words is "sixty-one million, nine hundred fifteen thousand, nine hundred one".