109402839121 has 9 divisors (see below), whose sum is σ = 109830855441. Its totient is φ = 108976488192.

The previous prime is 109402839067. The next prime is 109402839179. The reversal of 109402839121 is 121938204901.

It is a happy number.

The square root of 109402839121 is 330761.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 39875696721 + 69527142400 = 199689^2 + 263680^2 .

It is not a de Polignac number, because 109402839121 - 2²³ = 109394450513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109402819121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 116758165 + ... + 116759101.

Almost surely, 2^109402839121 is an apocalyptic number.

109402839121 is the 330761-st square number.

109402839121 is the 165381-st centered octagonal number.

It is an amenable number.

109402839121 is a deficient number, since it is larger than the sum of its proper divisors (428016320).

109402839121 is an frugal number, since it uses more digits than its factorization.

109402839121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2580 (or 1290 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The spelling of 109402839121 in words is "one hundred nine billion, four hundred two million, eight hundred thirty-nine thousand, one hundred twenty-one".