81051190 has 32 divisors (see below), whose sum is σ = 159555744. Its totient is φ = 29399040.

The previous prime is 81051181. The next prime is 81051193. The reversal of 81051190 is 9115018.

It is a super-2 number, since 2×81051190² = 13138590800832200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81051193) 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, 62832 + ... + 64108.

It is an arithmetic number, because the mean of its divisors is an integer number (4986117).

Almost surely, 2^81051190 is an apocalyptic number.

81051190 is a deficient number, since it is larger than the sum of its proper divisors (78504554).

81051190 is a wasteful number, since it uses less digits than its factorization.

81051190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1872.

The product of its (nonzero) digits is 360, while the sum is 25.

The square root of 81051190 is about 9002.8434397139. The cubic root of 81051190 is about 432.7659985099.

The spelling of 81051190 in words is "eighty-one million, fifty-one thousand, one hundred ninety".