2970921891 has 48 divisors (see below), whose sum is σ = 4836153600. Its totient is φ = 1614457152.

The previous prime is 2970921881. The next prime is 2970921911. The reversal of 2970921891 is 1981290792.

It is not a de Polignac number, because 2970921891 - 2⁶ = 2970921827 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2970921891.

It is not an unprimeable number, because it can be changed into a prime (2970921881) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 602745 + ... + 607653.

It is an arithmetic number, because the mean of its divisors is an integer number (100753200).

Almost surely, 2^2970921891 is an apocalyptic number.

2970921891 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2970921891 is a deficient number, since it is larger than the sum of its proper divisors (1865231709).

2970921891 is a wasteful number, since it uses less digits than its factorization.

2970921891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5128 (or 5121 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 48.

The square root of 2970921891 is about 54506.1637890615. The cubic root of 2970921891 is about 1437.5746678896.

The spelling of 2970921891 in words is "two billion, nine hundred seventy million, nine hundred twenty-one thousand, eight hundred ninety-one".