61909963 has 2 divisors, whose sum is σ = 61909964. Its totient is φ = 61909962.

The previous prime is 61909957. The next prime is 61909973. The reversal of 61909963 is 36990916.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61909963 - 2⁵ = 61909931 is a prime.

It is a super-2 number, since 2×61909963² = 7665687037322738, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61909973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30954981 + 30954982.

It is an arithmetic number, because the mean of its divisors is an integer number (30954982).

Almost surely, 2^61909963 is an apocalyptic number.

61909963 is a deficient number, since it is larger than the sum of its proper divisors (1).

61909963 is an equidigital number, since it uses as much as digits as its factorization.

61909963 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78732, while the sum is 43.

The square root of 61909963 is about 7868.2884415863. The cubic root of 61909963 is about 395.5974785338.

The spelling of 61909963 in words is "sixty-one million, nine hundred nine thousand, nine hundred sixty-three".