81137402 has 8 divisors (see below), whose sum is σ = 123522816. Its totient is φ = 39963132.

The previous prime is 81137377. The next prime is 81137453. The reversal of 81137402 is 20473118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302618 + ... + 302885.

It is an arithmetic number, because the mean of its divisors is an integer number (15440352).

Almost surely, 2^81137402 is an apocalyptic number.

81137402 is a deficient number, since it is larger than the sum of its proper divisors (42385414).

81137402 is a wasteful number, since it uses less digits than its factorization.

81137402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605572.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 81137402 is about 9007.6302099942. The cubic root of 81137402 is about 432.9193847080.

The spelling of 81137402 in words is "eighty-one million, one hundred thirty-seven thousand, four hundred two".