81414637 has 4 divisors (see below), whose sum is σ = 82529980. Its totient is φ = 80299296.

The previous prime is 81414623. The next prime is 81414659. The reversal of 81414637 is 73641418.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64979721 + 16434916 = 8061^2 + 4054^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81414637 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 (81414667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 557562 + ... + 557707.

It is an arithmetic number, because the mean of its divisors is an integer number (20632495).

Almost surely, 2^81414637 is an apocalyptic number.

It is an amenable number.

81414637 is a deficient number, since it is larger than the sum of its proper divisors (1115343).

81414637 is a wasteful number, since it uses less digits than its factorization.

81414637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115342.

The product of its digits is 16128, while the sum is 34.

The square root of 81414637 is about 9023.0059847038. The cubic root of 81414637 is about 433.4118989040.

It can be divided in two parts, 814 and 14637, that added together give a palindrome (15451).

The spelling of 81414637 in words is "eighty-one million, four hundred fourteen thousand, six hundred thirty-seven".