81431246 has 16 divisors (see below), whose sum is σ = 136080000. Its totient is φ = 36287328.

The previous prime is 81431237. The next prime is 81431261. The reversal of 81431246 is 64213418.

It is a super-2 number, since 2×81431246² = 13262095650225032, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53246 + ... + 54753.

It is an arithmetic number, because the mean of its divisors is an integer number (8505000).

Almost surely, 2^81431246 is an apocalyptic number.

81431246 is a deficient number, since it is larger than the sum of its proper divisors (54648754).

81431246 is a wasteful number, since it uses less digits than its factorization.

81431246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108043.

The product of its digits is 4608, while the sum is 29.

The square root of 81431246 is about 9023.9263073232. The cubic root of 81431246 is about 433.4413696439.

The spelling of 81431246 in words is "eighty-one million, four hundred thirty-one thousand, two hundred forty-six".