61516691 has 2 divisors, whose sum is σ = 61516692. Its totient is φ = 61516690.

The previous prime is 61516673. The next prime is 61516717. The reversal of 61516691 is 19661516.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61516691 - 2¹⁸ = 61254547 is a prime.

It is not a weakly prime, because it can be changed into another prime (61516391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30758345 + 30758346.

It is an arithmetic number, because the mean of its divisors is an integer number (30758346).

Almost surely, 2^61516691 is an apocalyptic number.

61516691 is a deficient number, since it is larger than the sum of its proper divisors (1).

61516691 is an equidigital number, since it uses as much as digits as its factorization.

61516691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 35.

The square root of 61516691 is about 7843.2576777765. The cubic root of 61516691 is about 394.7580444187.

The spelling of 61516691 in words is "sixty-one million, five hundred sixteen thousand, six hundred ninety-one".