2161006451 has 16 divisors (see below), whose sum is σ = 2208864000. Its totient is φ = 2113884000.

The previous prime is 2161006447. The next prime is 2161006453. The reversal of 2161006451 is 1546001612.

2161006451 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 2161006451 - 2² = 2161006447 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2161006451.

It is not an unprimeable number, because it can be changed into a prime (2161006453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3127016 + ... + 3127706.

It is an arithmetic number, because the mean of its divisors is an integer number (138054000).

Almost surely, 2^2161006451 is an apocalyptic number.

2161006451 is a deficient number, since it is larger than the sum of its proper divisors (47857549).

2161006451 is a wasteful number, since it uses less digits than its factorization.

2161006451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 2161006451 is about 46486.6265822763. The cubic root of 2161006451 is about 1292.8615544133.

The spelling of 2161006451 in words is "two billion, one hundred sixty-one million, six thousand, four hundred fifty-one".