1253440511 has 4 divisors (see below), whose sum is σ = 1254225024. Its totient is φ = 1252656000.

The previous prime is 1253440501. The next prime is 1253440541. The reversal of 1253440511 is 1150443521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1150443521 = 19 ⋅60549659.

It is a cyclic number.

It is not a de Polignac number, because 1253440511 - 2²⁶ = 1186331647 is a prime.

It is a super-2 number, since 2×1253440511² = 3142226229231882242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1253440501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 389855 + ... + 393056.

It is an arithmetic number, because the mean of its divisors is an integer number (313556256).

Almost surely, 2^1253440511 is an apocalyptic number.

1253440511 is a deficient number, since it is larger than the sum of its proper divisors (784513).

1253440511 is an equidigital number, since it uses as much as digits as its factorization.

1253440511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784512.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 1253440511 is about 35403.9617980813. The cubic root of 1253440511 is about 1078.2047538184.

The spelling of 1253440511 in words is "one billion, two hundred fifty-three million, four hundred forty thousand, five hundred eleven".