2161377451 has 2 divisors, whose sum is σ = 2161377452. Its totient is φ = 2161377450.

The previous prime is 2161377431. The next prime is 2161377457. The reversal of 2161377451 is 1547731612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2161377451 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2161377451.

It is not a weakly prime, because it can be changed into another prime (2161377457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080688725 + 1080688726.

It is an arithmetic number, because the mean of its divisors is an integer number (1080688726).

Almost surely, 2^2161377451 is an apocalyptic number.

2161377451 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161377451 is an equidigital number, since it uses as much as digits as its factorization.

2161377451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 37.

The square root of 2161377451 is about 46490.6168059749. The cubic root of 2161377451 is about 1292.9355360204.

The spelling of 2161377451 in words is "two billion, one hundred sixty-one million, three hundred seventy-seven thousand, four hundred fifty-one".