2151739581 has 16 divisors (see below), whose sum is σ = 2891660160. Its totient is φ = 1423180800.

The previous prime is 2151739549. The next prime is 2151739609. The reversal of 2151739581 is 1859371512.

It is not a de Polignac number, because 2151739581 - 2⁵ = 2151739549 is a prime.

It is a super-2 number, since 2×2151739581² = 9259966448884111122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151739501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 418281 + ... + 423393.

It is an arithmetic number, because the mean of its divisors is an integer number (180728760).

Almost surely, 2^2151739581 is an apocalyptic number.

It is an amenable number.

2151739581 is a deficient number, since it is larger than the sum of its proper divisors (739920579).

2151739581 is a wasteful number, since it uses less digits than its factorization.

2151739581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6196.

The product of its digits is 75600, while the sum is 42.

The square root of 2151739581 is about 46386.8470689699. The cubic root of 2151739581 is about 1291.0108818147.

The spelling of 2151739581 in words is "two billion, one hundred fifty-one million, seven hundred thirty-nine thousand, five hundred eighty-one".