81479031 has 8 divisors (see below), whose sum is σ = 108810240. Its totient is φ = 54233592.

The previous prime is 81479017. The next prime is 81479039. The reversal of 81479031 is 13097418.

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

It is a de Polignac number, because none of the positive numbers 2^k-81479031 is a prime.

It is a super-2 number, since 2×81479031² = 13277664985397922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81478983 and 81479001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81479039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19191 + ... + 23048.

It is an arithmetic number, because the mean of its divisors is an integer number (13601280).

Almost surely, 2^81479031 is an apocalyptic number.

81479031 is a deficient number, since it is larger than the sum of its proper divisors (27331209).

81479031 is a wasteful number, since it uses less digits than its factorization.

81479031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42885.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 81479031 is about 9026.5736024252. The cubic root of 81479031 is about 433.5261362285.

The spelling of 81479031 in words is "eighty-one million, four hundred seventy-nine thousand, thirty-one".