61791647 has 2 divisors, whose sum is σ = 61791648. Its totient is φ = 61791646.

The previous prime is 61791607. The next prime is 61791671. The reversal of 61791647 is 74619716.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61791647 - 2⁸ = 61791391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61791607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30895823 + 30895824.

It is an arithmetic number, because the mean of its divisors is an integer number (30895824).

Almost surely, 2^61791647 is an apocalyptic number.

61791647 is a deficient number, since it is larger than the sum of its proper divisors (1).

61791647 is an equidigital number, since it uses as much as digits as its factorization.

61791647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 41.

The square root of 61791647 is about 7860.7663112447. The cubic root of 61791647 is about 395.3453093226.

The spelling of 61791647 in words is "sixty-one million, seven hundred ninety-one thousand, six hundred forty-seven".