490139521 has 4 divisors (see below), whose sum is σ = 490234032. Its totient is φ = 490045012.

The previous prime is 490139509. The next prime is 490139539. The reversal of 490139521 is 125931094.

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.

It is a cyclic number.

It is not a de Polignac number, because 490139521 - 2²¹ = 488042369 is a prime.

It is a super-2 number, since 2×490139521² = 480473500092218882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (490139581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38995 + ... + 50008.

It is an arithmetic number, because the mean of its divisors is an integer number (122558508).

Almost surely, 2^490139521 is an apocalyptic number.

It is an amenable number.

490139521 is a deficient number, since it is larger than the sum of its proper divisors (94511).

490139521 is an equidigital number, since it uses as much as digits as its factorization.

490139521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94510.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 490139521 is about 22139.0948550296. The cubic root of 490139521 is about 788.4483355100.

The spelling of 490139521 in words is "four hundred ninety million, one hundred thirty-nine thousand, five hundred twenty-one".