2813971581 has 6 divisors (see below), whose sum is σ = 4064625630. Its totient is φ = 1875981048.

The previous prime is 2813971579. The next prime is 2813971583. The reversal of 2813971581 is 1851793182.

It is an interprime number because it is at equal distance from previous prime (2813971579) and next prime (2813971583).

It can be written as a sum of positive squares in only one way, i.e., 2501000100 + 312971481 = 50010^2 + 17691^2 .

It is not a de Polignac number, because 2813971581 - 2¹ = 2813971579 is a prime.

It is a super-2 number, since 2×2813971581² = 15836872117351279122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2813971583) 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, 156331746 + ... + 156331763.

It is an arithmetic number, because the mean of its divisors is an integer number (677437605).

Almost surely, 2^2813971581 is an apocalyptic number.

It is an amenable number.

2813971581 is a deficient number, since it is larger than the sum of its proper divisors (1250654049).

2813971581 is a wasteful number, since it uses less digits than its factorization.

2813971581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312663515 (or 312663512 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 2813971581 is about 53046.8809733428. The cubic root of 2813971581 is about 1411.8001889724.

The spelling of 2813971581 in words is "two billion, eight hundred thirteen million, nine hundred seventy-one thousand, five hundred eighty-one".