490973621 has 2 divisors, whose sum is σ = 490973622. Its totient is φ = 490973620.

The previous prime is 490973603. The next prime is 490973641. The reversal of 490973621 is 126379094.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 353966596 + 137007025 = 18814^2 + 11705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-490973621 is a prime.

It is a super-3 number, since 3×490973621³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (490973641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245486810 + 245486811.

It is an arithmetic number, because the mean of its divisors is an integer number (245486811).

Almost surely, 2^490973621 is an apocalyptic number.

It is an amenable number.

490973621 is a deficient number, since it is larger than the sum of its proper divisors (1).

490973621 is an equidigital number, since it uses as much as digits as its factorization.

490973621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 490973621 is about 22157.9245643630. The cubic root of 490973621 is about 788.8953320824.

The spelling of 490973621 in words is "four hundred ninety million, nine hundred seventy-three thousand, six hundred twenty-one".