9902465891 has 2 divisors, whose sum is σ = 9902465892. Its totient is φ = 9902465890.

The previous prime is 9902465863. The next prime is 9902465893. The reversal of 9902465891 is 1985642099.

9902465891 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9902465891 - 2⁶ = 9902465827 is a prime.

Together with 9902465893, 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 (9902465893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4951232945 + 4951232946.

It is an arithmetic number, because the mean of its divisors is an integer number (4951232946).

Almost surely, 2^9902465891 is an apocalyptic number.

9902465891 is a deficient number, since it is larger than the sum of its proper divisors (1).

9902465891 is an equidigital number, since it uses as much as digits as its factorization.

9902465891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1399680, while the sum is 53.

The square root of 9902465891 is about 99511.1345076520. The cubic root of 9902465891 is about 2147.4074314274.

The spelling of 9902465891 in words is "nine billion, nine hundred two million, four hundred sixty-five thousand, eight hundred ninety-one".