81983125 has 30 divisors (see below), whose sum is σ = 119216526. Its totient is φ = 56196000.

The previous prime is 81983123. The next prime is 81983131. The reversal of 81983125 is 52138918.

It can be written as a sum of positive squares in 5 ways, for example, as 58110129 + 23872996 = 7623^2 + 4886^2 .

It is not a de Polignac number, because 81983125 - 2¹ = 81983123 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81983123) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 29287 + ... + 31963.

Almost surely, 2^81983125 is an apocalyptic number.

It is an amenable number.

81983125 is a deficient number, since it is larger than the sum of its proper divisors (37233401).

81983125 is an equidigital number, since it uses as much as digits as its factorization.

81983125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2711 (or 2689 counting only the distinct ones).

The product of its digits is 17280, while the sum is 37.

The square root of 81983125 is about 9054.4533241936. The cubic root of 81983125 is about 434.4183444489.

The spelling of 81983125 in words is "eighty-one million, nine hundred eighty-three thousand, one hundred twenty-five".