61961687 has 2 divisors, whose sum is σ = 61961688. Its totient is φ = 61961686.

The previous prime is 61961671. The next prime is 61961707. The reversal of 61961687 is 78616916.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61961687 - 2⁴ = 61961671 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61961657) 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, 30980843 + 30980844.

It is an arithmetic number, because the mean of its divisors is an integer number (30980844).

Almost surely, 2^61961687 is an apocalyptic number.

61961687 is a deficient number, since it is larger than the sum of its proper divisors (1).

61961687 is an equidigital number, since it uses as much as digits as its factorization.

61961687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 61961687 is about 7871.5746201125. The cubic root of 61961687 is about 395.7076179857.

The spelling of 61961687 in words is "sixty-one million, nine hundred sixty-one thousand, six hundred eighty-seven".