9902251 has 4 divisors (see below), whose sum is σ = 9953752. Its totient is φ = 9850752.

The previous prime is 9902239. The next prime is 9902257. The reversal of 9902251 is 1522099.

9902251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1522099 = 1049 ⋅1451.

It is a cyclic number.

It is not a de Polignac number, because 9902251 - 2⁵ = 9902219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9902257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25461 + ... + 25846.

It is an arithmetic number, because the mean of its divisors is an integer number (2488438).

Almost surely, 2^9902251 is an apocalyptic number.

9902251 is a deficient number, since it is larger than the sum of its proper divisors (51501).

9902251 is a wasteful number, since it uses less digits than its factorization.

9902251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51500.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 9902251 is about 3146.7842315608. The cubic root of 9902251 is about 214.7391897860.

It can be divided in two parts, 9902 and 251, that added together give a triangular number (10153 = T₁₄₂).

The spelling of 9902251 in words is "nine million, nine hundred two thousand, two hundred fifty-one".