61581607 has 2 divisors, whose sum is σ = 61581608. Its totient is φ = 61581606.

The previous prime is 61581589. The next prime is 61581617. The reversal of 61581607 is 70618516.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61581607 - 2²³ = 53192999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61581617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30790803 + 30790804.

It is an arithmetic number, because the mean of its divisors is an integer number (30790804).

Almost surely, 2^61581607 is an apocalyptic number.

61581607 is a deficient number, since it is larger than the sum of its proper divisors (1).

61581607 is an equidigital number, since it uses as much as digits as its factorization.

61581607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 61581607 is about 7847.3949180604. The cubic root of 61581607 is about 394.8968528409.

The spelling of 61581607 in words is "sixty-one million, five hundred eighty-one thousand, six hundred seven".