490892921 has 4 divisors (see below), whose sum is σ = 499213200. Its totient is φ = 482572644.

The previous prime is 490892917. The next prime is 490892971. The reversal of 490892921 is 129298094.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 129298094 = 2 ⋅64649047.

It is a cyclic number.

It is not a de Polignac number, because 490892921 - 2² = 490892917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (490892971) 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, 4160051 + ... + 4160168.

It is an arithmetic number, because the mean of its divisors is an integer number (124803300).

Almost surely, 2^490892921 is an apocalyptic number.

It is an amenable number.

490892921 is a deficient number, since it is larger than the sum of its proper divisors (8320279).

490892921 is an equidigital number, since it uses as much as digits as its factorization.

490892921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8320278.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 490892921 is about 22156.1034706015. The cubic root of 490892921 is about 788.8521068533.

The spelling of 490892921 in words is "four hundred ninety million, eight hundred ninety-two thousand, nine hundred twenty-one".