902991 has 4 divisors (see below), whose sum is σ = 1203992. Its totient is φ = 601992.

The previous prime is 902987. The next prime is 903017. The reversal of 902991 is 199209.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199209 = 3 ⋅66403.

It is not a de Polignac number, because 902991 - 2² = 902987 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (902971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150496 + ... + 150501.

It is an arithmetic number, because the mean of its divisors is an integer number (300998).

2⁹⁰²⁹⁹¹ is an apocalyptic number.

902991 is a deficient number, since it is larger than the sum of its proper divisors (301001).

902991 is a wasteful number, since it uses less digits than its factorization.

902991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301000.

The product of its (nonzero) digits is 1458, while the sum is 30.

The square root of 902991 is about 950.2583859141. The cubic root of 902991 is about 96.6557749652.

It can be divided in two parts, 90 and 2991, that added together give a triangular number (3081 = T₇₈).

The spelling of 902991 in words is "nine hundred two thousand, nine hundred ninety-one".