1646512489 has 2 divisors, whose sum is σ = 1646512490. Its totient is φ = 1646512488.

The previous prime is 1646512459. The next prime is 1646512501. The reversal of 1646512489 is 9842156461.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1403776089 + 242736400 = 37467^2 + 15580^2 .

It is a cyclic number.

It is not a de Polignac number, because 1646512489 - 2⁵ = 1646512457 is a prime.

It is a super-2 number, since 2×1646512489² = 5422006752865950242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1646512409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 823256244 + 823256245.

It is an arithmetic number, because the mean of its divisors is an integer number (823256245).

Almost surely, 2^1646512489 is an apocalyptic number.

It is an amenable number.

1646512489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1646512489 is an equidigital number, since it uses as much as digits as its factorization.

1646512489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 414720, while the sum is 46.

The square root of 1646512489 is about 40577.2410225239. The cubic root of 1646512489 is about 1180.8326233545.

The spelling of 1646512489 in words is "one billion, six hundred forty-six million, five hundred twelve thousand, four hundred eighty-nine".