81490983 has 16 divisors (see below), whose sum is σ = 127534080. Its totient is φ = 45307296.

The previous prime is 81490973. The next prime is 81491009. The reversal of 81490983 is 38909418.

It is not a de Polignac number, because 81490983 - 2⁶ = 81490919 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81490973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51663 + ... + 53216.

It is an arithmetic number, because the mean of its divisors is an integer number (7970880).

Almost surely, 2^81490983 is an apocalyptic number.

81490983 is a deficient number, since it is larger than the sum of its proper divisors (46043097).

81490983 is a wasteful number, since it uses less digits than its factorization.

81490983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104926.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 81490983 is about 9027.2356233788. The cubic root of 81490983 is about 433.5473328930.

The spelling of 81490983 in words is "eighty-one million, four hundred ninety thousand, nine hundred eighty-three".