1253818612 has 24 divisors (see below), whose sum is σ = 2329527816. Its totient is φ = 588438528.

The previous prime is 1253818609. The next prime is 1253818613. The reversal of 1253818612 is 2168183521.

It can be written as a sum of positive squares in 4 ways, for example, as 457788816 + 796029796 = 21396^2 + 28214^2 .

It is a super-2 number, since 2×1253818612² = 3144122223595213088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1253818613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 648 + ... + 50080.

It is an arithmetic number, because the mean of its divisors is an integer number (97063659).

Almost surely, 2^1253818612 is an apocalyptic number.

It is an amenable number.

1253818612 is a deficient number, since it is larger than the sum of its proper divisors (1075709204).

1253818612 is a wasteful number, since it uses less digits than its factorization.

1253818612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49827 (or 49825 counting only the distinct ones).

The product of its digits is 23040, while the sum is 37.

The square root of 1253818612 is about 35409.3012074511. The cubic root of 1253818612 is about 1078.3131565992.

The spelling of 1253818612 in words is "one billion, two hundred fifty-three million, eight hundred eighteen thousand, six hundred twelve".