109902491 has 2 divisors, whose sum is σ = 109902492. Its totient is φ = 109902490.

The previous prime is 109902461. The next prime is 109902493. The reversal of 109902491 is 194209901.

It is a strong prime.

It is an emirp because it is prime and its reverse (194209901) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109902491 is a prime.

It is a Sophie Germain prime.

Together with 109902493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (109902493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54951245 + 54951246.

It is an arithmetic number, because the mean of its divisors is an integer number (54951246).

Almost surely, 2^109902491 is an apocalyptic number.

109902491 is a deficient number, since it is larger than the sum of its proper divisors (1).

109902491 is an equidigital number, since it uses as much as digits as its factorization.

109902491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 109902491 is about 10483.4388918904. The cubic root of 109902491 is about 479.0003661069. Note that the first 3 decimals are identical.

The spelling of 109902491 in words is "one hundred nine million, nine hundred two thousand, four hundred ninety-one".