61291961 has 2 divisors, whose sum is σ = 61291962. Its totient is φ = 61291960.

The previous prime is 61291949. The next prime is 61291969. The reversal of 61291961 is 16919216.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36481600 + 24810361 = 6040^2 + 4981^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61291961 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61291969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30645980 + 30645981.

It is an arithmetic number, because the mean of its divisors is an integer number (30645981).

Almost surely, 2^61291961 is an apocalyptic number.

It is an amenable number.

61291961 is a deficient number, since it is larger than the sum of its proper divisors (1).

61291961 is an equidigital number, since it uses as much as digits as its factorization.

61291961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 35.

The square root of 61291961 is about 7828.9182522236. The cubic root of 61291961 is about 394.2767537734.

The spelling of 61291961 in words is "sixty-one million, two hundred ninety-one thousand, nine hundred sixty-one".