2161001401 has 16 divisors (see below), whose sum is σ = 2341293696. Its totient is φ = 1982762496.

The previous prime is 2161001399. The next prime is 2161001411. The reversal of 2161001401 is 1041001612.

It is not a de Polignac number, because 2161001401 - 2¹ = 2161001399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2161001411) 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, 2032396 + ... + 2033458.

It is an arithmetic number, because the mean of its divisors is an integer number (146330856).

Almost surely, 2^2161001401 is an apocalyptic number.

It is an amenable number.

2161001401 is a deficient number, since it is larger than the sum of its proper divisors (180292295).

2161001401 is a wasteful number, since it uses less digits than its factorization.

2161001401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1872.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 2161001401 is about 46486.5722655478. The cubic root of 2161001401 is about 1292.8605473277.

The spelling of 2161001401 in words is "two billion, one hundred sixty-one million, one thousand, four hundred one".