2156345401 has 6 divisors (see below), whose sum is σ = 2508401850. Its totient is φ = 1848296016.

The previous prime is 2156345363. The next prime is 2156345417. The reversal of 2156345401 is 1045436512.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2121523600 + 34821801 = 46060^2 + 5901^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2156345401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2156345201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22003476 + ... + 22003573.

It is an arithmetic number, because the mean of its divisors is an integer number (418066975).

Almost surely, 2^2156345401 is an apocalyptic number.

It is an amenable number.

2156345401 is a deficient number, since it is larger than the sum of its proper divisors (352056449).

2156345401 is an equidigital number, since it uses as much as digits as its factorization.

2156345401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44007063 (or 44007056 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 2156345401 is about 46436.4662845915. The cubic root of 2156345401 is about 1291.9313659077.

The spelling of 2156345401 in words is "two billion, one hundred fifty-six million, three hundred forty-five thousand, four hundred one".