1253431645 has 8 divisors (see below), whose sum is σ = 1526567904. Its totient is φ = 987778704.

The previous prime is 1253431603. The next prime is 1253431661. The reversal of 1253431645 is 5461343521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1253431645 - 2⁹ = 1253431133 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1253431645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1870459 + ... + 1871128.

It is an arithmetic number, because the mean of its divisors is an integer number (190820988).

Almost surely, 2^1253431645 is an apocalyptic number.

It is an amenable number.

1253431645 is a deficient number, since it is larger than the sum of its proper divisors (273136259).

1253431645 is an equidigital number, since it uses as much as digits as its factorization.

1253431645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3741659.

The product of its digits is 43200, while the sum is 34.

The square root of 1253431645 is about 35403.8365858843. The cubic root of 1253431645 is about 1078.2022116459.

The spelling of 1253431645 in words is "one billion, two hundred fifty-three million, four hundred thirty-one thousand, six hundred forty-five".