902181 has 8 divisors (see below), whose sum is σ = 1374784. Its totient is φ = 515520.

The previous prime is 902179. The next prime is 902191. The reversal of 902181 is 181209.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 902181 - 2¹ = 902179 is a prime.

It is a super-2 number, since 2×902181² = 1627861113522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 42961 = 902181 / (9 + 0 + 2 + 1 + 8 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (902141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21460 + ... + 21501.

It is an arithmetic number, because the mean of its divisors is an integer number (171848).

2⁹⁰²¹⁸¹ is an apocalyptic number.

It is an amenable number.

902181 is a deficient number, since it is larger than the sum of its proper divisors (472603).

902181 is a wasteful number, since it uses less digits than its factorization.

902181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42971.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 902181 is about 949.8320904244. The cubic root of 902181 is about 96.6268656335.

The spelling of 902181 in words is "nine hundred two thousand, one hundred eighty-one".