2151374581 has 4 divisors (see below), whose sum is σ = 2201406592. Its totient is φ = 2101342572.

The previous prime is 2151374527. The next prime is 2151374593. The reversal of 2151374581 is 1854731512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2151374581 - 2¹³ = 2151366389 is a prime.

It is a super-2 number, since 2×2151374581² = 9256825175545851122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2151374581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151374501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25015941 + ... + 25016026.

It is an arithmetic number, because the mean of its divisors is an integer number (550351648).

Almost surely, 2^2151374581 is an apocalyptic number.

It is an amenable number.

2151374581 is a deficient number, since it is larger than the sum of its proper divisors (50032011).

2151374581 is an equidigital number, since it uses as much as digits as its factorization.

2151374581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50032010.

The product of its digits is 33600, while the sum is 37.

The square root of 2151374581 is about 46382.9125972054. The cubic root of 2151374581 is about 1290.9378795451.

The spelling of 2151374581 in words is "two billion, one hundred fifty-one million, three hundred seventy-four thousand, five hundred eighty-one".