2957187891 has 16 divisors (see below), whose sum is σ = 4533841664. Its totient is φ = 1679452704.

The previous prime is 2957187851. The next prime is 2957187899. The reversal of 2957187891 is 1987817592.

It is not a de Polignac number, because 2957187891 - 2¹⁰ = 2957186867 is a prime.

It is a super-3 number, since 3×2957187891³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2957187899) 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, 428536 + ... + 435381.

It is an arithmetic number, because the mean of its divisors is an integer number (283365104).

Almost surely, 2^2957187891 is an apocalyptic number.

2957187891 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2957187891 is a deficient number, since it is larger than the sum of its proper divisors (1576653773).

2957187891 is a wasteful number, since it uses less digits than its factorization.

2957187891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864090.

The product of its digits is 2540160, while the sum is 57.

The square root of 2957187891 is about 54380.0320981884. The cubic root of 2957187891 is about 1435.3560352800.

The spelling of 2957187891 in words is "two billion, nine hundred fifty-seven million, one hundred eighty-seven thousand, eight hundred ninety-one".