81461983 has 2 divisors, whose sum is σ = 81461984. Its totient is φ = 81461982.

The previous prime is 81461971. The next prime is 81462001. The reversal of 81461983 is 38916418.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81461983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81461903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40730991 + 40730992.

It is an arithmetic number, because the mean of its divisors is an integer number (40730992).

Almost surely, 2^81461983 is an apocalyptic number.

81461983 is a deficient number, since it is larger than the sum of its proper divisors (1).

81461983 is an equidigital number, since it uses as much as digits as its factorization.

81461983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 40.

The square root of 81461983 is about 9025.6292301424. The cubic root of 81461983 is about 433.4958983092.

The spelling of 81461983 in words is "eighty-one million, four hundred sixty-one thousand, nine hundred eighty-three".