109902431 has 4 divisors (see below), whose sum is σ = 113692200. Its totient is φ = 106112664.

The previous prime is 109902421. The next prime is 109902437. The reversal of 109902431 is 134209901.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109902431 is a prime.

It is a super-2 number, since 2×109902431² = 24157088679419522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 3789739 = 109902431 / (1 + 0 + 9 + 9 + 0 + 2 + 4 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 109902394 and 109902403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109902437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1894841 + ... + 1894898.

It is an arithmetic number, because the mean of its divisors is an integer number (28423050).

Almost surely, 2^109902431 is an apocalyptic number.

109902431 is a deficient number, since it is larger than the sum of its proper divisors (3789769).

109902431 is an equidigital number, since it uses as much as digits as its factorization.

109902431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3789768.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 109902431 is about 10483.4360302336. The cubic root of 109902431 is about 479.0002789386. Note that the first 3 decimals are identical.

The spelling of 109902431 in words is "one hundred nine million, nine hundred two thousand, four hundred thirty-one".