2001402091 has 16 divisors (see below), whose sum is σ = 2217562144. Its totient is φ = 1794887424.

The previous prime is 2001402049. The next prime is 2001402097. The reversal of 2001402091 is 1902041002.

It is a cyclic number.

It is not a de Polignac number, because 2001402091 - 2¹⁹ = 2000877803 is a prime.

It is a super-2 number, since 2×2001402091² = 8011220659718344562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001402097) 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, 47845 + ... + 79321.

It is an arithmetic number, because the mean of its divisors is an integer number (138597634).

Almost surely, 2^2001402091 is an apocalyptic number.

2001402091 is a deficient number, since it is larger than the sum of its proper divisors (216160053).

2001402091 is a wasteful number, since it uses less digits than its factorization.

2001402091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31630.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 2001402091 is about 44737.0326575199. The cubic root of 2001402091 is about 1260.2154017817.

Adding to 2001402091 its reverse (1902041002), we get a palindrome (3903443093).

The spelling of 2001402091 in words is "two billion, one million, four hundred two thousand, ninety-one".