81953514 has 24 divisors (see below), whose sum is σ = 179564580. Its totient is φ = 27010368.

The previous prime is 81953513. The next prime is 81953533. The reversal of 81953514 is 41535918.

It can be written as a sum of positive squares in 2 ways, for example, as 79121025 + 2832489 = 8895^2 + 1683^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81953513) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23977 + ... + 27180.

Almost surely, 2^81953514 is an apocalyptic number.

81953514 is an abundant number, since it is smaller than the sum of its proper divisors (97611066).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81953514 is a wasteful number, since it uses less digits than its factorization.

81953514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51254 (or 51251 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 81953514 is about 9052.8180142981. The cubic root of 81953514 is about 434.3660364867.

The spelling of 81953514 in words is "eighty-one million, nine hundred fifty-three thousand, five hundred fourteen".