900645491 has 2 divisors, whose sum is σ = 900645492. Its totient is φ = 900645490.

The previous prime is 900645461. The next prime is 900645517. The reversal of 900645491 is 194546009.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 900645491 - 2¹⁸ = 900383347 is a prime.

It is a super-2 number, since 2×900645491² = 1622324600917262162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (900645461) 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 as a sum of consecutive naturals, namely, 450322745 + 450322746.

It is an arithmetic number, because the mean of its divisors is an integer number (450322746).

Almost surely, 2^900645491 is an apocalyptic number.

900645491 is a deficient number, since it is larger than the sum of its proper divisors (1).

900645491 is an equidigital number, since it uses as much as digits as its factorization.

900645491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 900645491 is about 30010.7562550496. The cubic root of 900645491 is about 965.7201497076.

The spelling of 900645491 in words is "nine hundred million, six hundred forty-five thousand, four hundred ninety-one".