81580954 has 32 divisors (see below), whose sum is σ = 157167360. Its totient is φ = 30868992.

The previous prime is 81580951. The next prime is 81580957. The reversal of 81580954 is 45908518.

It is an interprime number because it is at equal distance from previous prime (81580951) and next prime (81580957).

It is not an unprimeable number, because it can be changed into a prime (81580951) 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, 5559 + ... + 13930.

It is an arithmetic number, because the mean of its divisors is an integer number (4911480).

Almost surely, 2^81580954 is an apocalyptic number.

81580954 is a deficient number, since it is larger than the sum of its proper divisors (75586406).

81580954 is a wasteful number, since it uses less digits than its factorization.

81580954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19534.

The product of its (nonzero) digits is 57600, while the sum is 40.

The square root of 81580954 is about 9032.2175571672. The cubic root of 81580954 is about 433.7068284151.

The spelling of 81580954 in words is "eighty-one million, five hundred eighty thousand, nine hundred fifty-four".