489091531 has 2 divisors, whose sum is σ = 489091532. Its totient is φ = 489091530.

The previous prime is 489091517. The next prime is 489091553. The reversal of 489091531 is 135190984.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 489091531 - 2⁷ = 489091403 is a prime.

It is a super-2 number, since 2×489091531² = 478421051391847922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (489091571) 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, 244545765 + 244545766.

It is an arithmetic number, because the mean of its divisors is an integer number (244545766).

Almost surely, 2^489091531 is an apocalyptic number.

489091531 is a deficient number, since it is larger than the sum of its proper divisors (1).

489091531 is an equidigital number, since it uses as much as digits as its factorization.

489091531 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 40.

The square root of 489091531 is about 22115.4138781077. The cubic root of 489091531 is about 787.8859952354.

The spelling of 489091531 in words is "four hundred eighty-nine million, ninety-one thousand, five hundred thirty-one".