2161873451 has 2 divisors, whose sum is σ = 2161873452. Its totient is φ = 2161873450.

The previous prime is 2161873433. The next prime is 2161873513. The reversal of 2161873451 is 1543781612.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2161873451 is a prime.

It is not a weakly prime, because it can be changed into another prime (2161878451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080936725 + 1080936726.

It is an arithmetic number, because the mean of its divisors is an integer number (1080936726).

Almost surely, 2^2161873451 is an apocalyptic number.

2161873451 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161873451 is an equidigital number, since it uses as much as digits as its factorization.

2161873451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 38.

The square root of 2161873451 is about 46495.9509097298. The cubic root of 2161873451 is about 1293.0344308211.

The spelling of 2161873451 in words is "two billion, one hundred sixty-one million, eight hundred seventy-three thousand, four hundred fifty-one".