61707691 has 2 divisors, whose sum is σ = 61707692. Its totient is φ = 61707690.

The previous prime is 61707683. The next prime is 61707713. The reversal of 61707691 is 19670716.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61707691 - 2³ = 61707683 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61707691.

It is not a weakly prime, because it can be changed into another prime (61705691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30853845 + 30853846.

It is an arithmetic number, because the mean of its divisors is an integer number (30853846).

Almost surely, 2^61707691 is an apocalyptic number.

61707691 is a deficient number, since it is larger than the sum of its proper divisors (1).

61707691 is an equidigital number, since it uses as much as digits as its factorization.

61707691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 61707691 is about 7855.4243042626. The cubic root of 61707691 is about 395.1661769415.

It can be divided in two parts, 6170 and 7691, that added together give a triangular number (13861 = T₁₆₆).

The spelling of 61707691 in words is "sixty-one million, seven hundred seven thousand, six hundred ninety-one".