61275961 has 2 divisors, whose sum is σ = 61275962. Its totient is φ = 61275960.

The previous prime is 61275941. The next prime is 61276021. The reversal of 61275961 is 16957216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45427600 + 15848361 = 6740^2 + 3981^2 .

It is a cyclic number.

It is not a de Polignac number, because 61275961 - 2²¹ = 59178809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61275961.

It is not a weakly prime, because it can be changed into another prime (61275901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30637980 + 30637981.

It is an arithmetic number, because the mean of its divisors is an integer number (30637981).

Almost surely, 2^61275961 is an apocalyptic number.

It is an amenable number.

61275961 is a deficient number, since it is larger than the sum of its proper divisors (1).

61275961 is an equidigital number, since it uses as much as digits as its factorization.

61275961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 37.

The square root of 61275961 is about 7827.8963329876. The cubic root of 61275961 is about 394.2424427100.

The spelling of 61275961 in words is "sixty-one million, two hundred seventy-five thousand, nine hundred sixty-one".