61481971 has 2 divisors, whose sum is σ = 61481972. Its totient is φ = 61481970.

The previous prime is 61481941. The next prime is 61481977. The reversal of 61481971 is 17918416.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61481971 - 2⁵ = 61481939 is a prime.

It is equal to p_3644785 and since 61481971 and 3644785 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61481971.

It is not a weakly prime, because it can be changed into another prime (61481977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30740985 + 30740986.

It is an arithmetic number, because the mean of its divisors is an integer number (30740986).

Almost surely, 2^61481971 is an apocalyptic number.

61481971 is a deficient number, since it is larger than the sum of its proper divisors (1).

61481971 is an equidigital number, since it uses as much as digits as its factorization.

61481971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 37.

The square root of 61481971 is about 7841.0439993664. The cubic root of 61481971 is about 394.6837633391.

The spelling of 61481971 in words is "sixty-one million, four hundred eighty-one thousand, nine hundred seventy-one".