81479403 has 6 divisors (see below), whose sum is σ = 117692484. Its totient is φ = 54319596.

The previous prime is 81479399. The next prime is 81479471. The reversal of 81479403 is 30497418.

It is a happy number.

It is not a de Polignac number, because 81479403 - 2² = 81479399 is a prime.

It is a super-2 number, since 2×81479403² = 13277786226472818, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81439403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4526625 + ... + 4526642.

It is an arithmetic number, because the mean of its divisors is an integer number (19615414).

Almost surely, 2^81479403 is an apocalyptic number.

81479403 is a deficient number, since it is larger than the sum of its proper divisors (36213081).

81479403 is a wasteful number, since it uses less digits than its factorization.

81479403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9053273 (or 9053270 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 81479403 is about 9026.5942082272. The cubic root of 81479403 is about 433.5267959953.

The spelling of 81479403 in words is "eighty-one million, four hundred seventy-nine thousand, four hundred three".