1645234497 has 20 divisors (see below), whose sum is σ = 2458874880. Its totient is φ = 1096296984.

The previous prime is 1645234447. The next prime is 1645234499. The reversal of 1645234497 is 7944325461.

It is not a de Polignac number, because 1645234497 - 2⁷ = 1645234369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1645234499) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 241504 + ... + 248222.

It is an arithmetic number, because the mean of its divisors is an integer number (122943744).

Almost surely, 2^1645234497 is an apocalyptic number.

It is an amenable number.

1645234497 is a deficient number, since it is larger than the sum of its proper divisors (813640383).

1645234497 is an equidigital number, since it uses as much as digits as its factorization.

1645234497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9754 (or 9745 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The square root of 1645234497 is about 40561.4903202533. The cubic root of 1645234497 is about 1180.5270309244.

The spelling of 1645234497 in words is "one billion, six hundred forty-five million, two hundred thirty-four thousand, four hundred ninety-seven".