81313002 has 24 divisors (see below), whose sum is σ = 176588100. Its totient is φ = 27041280.

The previous prime is 81312997. The next prime is 81313007. The reversal of 81313002 is 20031318.

It is an interprime number because it is at equal distance from previous prime (81312997) and next prime (81313007).

It can be written as a sum of positive squares in 2 ways, for example, as 80622441 + 690561 = 8979^2 + 831^2 .

It is a super-2 number, since 2×81313002² = 13223608588504008, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (81313007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3052 + ... + 13112.

Almost surely, 2^81313002 is an apocalyptic number.

81313002 is an abundant number, since it is smaller than the sum of its proper divisors (95275098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81313002 is a wasteful number, since it uses less digits than its factorization.

81313002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10518 (or 10515 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 81313002 is about 9017.3722336388. The cubic root of 81313002 is about 433.2314720474.

It can be divided in two parts, 8 and 1313002, that added together give a triangular number (1313010 = T₁₆₂₀).

The spelling of 81313002 in words is "eighty-one million, three hundred thirteen thousand, two".