81474731 has 6 divisors (see below), whose sum is σ = 88224300. Its totient is φ = 75207288.

The previous prime is 81474719. The next prime is 81474733. The reversal of 81474731 is 13747418.

It is not a de Polignac number, because 81474731 - 2¹⁴ = 81458347 is a prime.

It is a super-2 number, since 2×81474731² = 13276263583044722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81474691 and 81474700.

It is not an unprimeable number, because it can be changed into a prime (81474733) 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, 240881 + ... + 241218.

It is an arithmetic number, because the mean of its divisors is an integer number (14704050).

Almost surely, 2^81474731 is an apocalyptic number.

81474731 is a deficient number, since it is larger than the sum of its proper divisors (6749569).

81474731 is a wasteful number, since it uses less digits than its factorization.

81474731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482125 (or 482112 counting only the distinct ones).

The product of its digits is 18816, while the sum is 35.

The square root of 81474731 is about 9026.3354136659. The cubic root of 81474731 is about 433.5185097461.

The spelling of 81474731 in words is "eighty-one million, four hundred seventy-four thousand, seven hundred thirty-one".