2161297952 has 24 divisors (see below), whose sum is σ = 4641879312. Its totient is φ = 982408000.

The previous prime is 2161297871. The next prime is 2161297973. The reversal of 2161297952 is 2597921612.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3069674 + ... + 3070377.

It is an arithmetic number, because the mean of its divisors is an integer number (193411638).

Almost surely, 2^2161297952 is an apocalyptic number.

2161297952 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2161297952 is an abundant number, since it is smaller than the sum of its proper divisors (2480581360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2161297952 is a wasteful number, since it uses less digits than its factorization.

2161297952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6140072 (or 6140064 counting only the distinct ones).

The product of its digits is 136080, while the sum is 44.

The square root of 2161297952 is about 46489.7617976259. The cubic root of 2161297952 is about 1292.9196837311.

The spelling of 2161297952 in words is "two billion, one hundred sixty-one million, two hundred ninety-seven thousand, nine hundred fifty-two".