201028879409 has 16 divisors (see below), whose sum is σ = 208027747200. Its totient is φ = 194113511424.

The previous prime is 201028879343. The next prime is 201028879433. The reversal of 201028879409 is 904978820102.

It is a cyclic number.

It is not a de Polignac number, because 201028879409 - 2²⁸ = 200760443953 is a prime.

It is a super-2 number, since 2×201028879409² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (201028879489) 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, 17063729 + ... + 17075505.

It is an arithmetic number, because the mean of its divisors is an integer number (13001734200).

Almost surely, 2^201028879409 is an apocalyptic number.

It is an amenable number.

201028879409 is a deficient number, since it is larger than the sum of its proper divisors (6998867791).

201028879409 is a wasteful number, since it uses less digits than its factorization.

201028879409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15272.

The product of its (nonzero) digits is 580608, while the sum is 50.

The spelling of 201028879409 in words is "two hundred one billion, twenty-eight million, eight hundred seventy-nine thousand, four hundred nine".