1253636145 has 12 divisors (see below), whose sum is σ = 2172969396. Its totient is φ = 668605920.

The previous prime is 1253636119. The next prime is 1253636159. The reversal of 1253636145 is 5416363521.

1253636145 is a `hidden beast` number, since 1 + 2 + 5 + 3 + 636 + 14 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 735982641 + 517653504 = 27129^2 + 22752^2 .

It is not a de Polignac number, because 1253636145 - 2¹⁶ = 1253570609 is a prime.

It is a super-2 number, since 2×1253636145² = 3143207168100922050, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13929246 + ... + 13929335.

It is an arithmetic number, because the mean of its divisors is an integer number (181080783).

Almost surely, 2^1253636145 is an apocalyptic number.

1253636145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1253636145 is a deficient number, since it is larger than the sum of its proper divisors (919333251).

1253636145 is a wasteful number, since it uses less digits than its factorization.

1253636145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27858592 (or 27858589 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 1253636145 is about 35406.7245731655. The cubic root of 1253636145 is about 1078.2608454408.

Adding to 1253636145 its reverse (5416363521), we get a palindrome (6669999666).

The spelling of 1253636145 in words is "one billion, two hundred fifty-three million, six hundred thirty-six thousand, one hundred forty-five".