1253135531 has 4 divisors (see below), whose sum is σ = 1266054552. Its totient is φ = 1240216512.

The previous prime is 1253135489. The next prime is 1253135579. The reversal of 1253135531 is 1355313521.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1253135531 is a prime.

It is a super-2 number, since 2×1253135531² = 3140697318109303922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1253135494 and 1253135503.

It is not an unprimeable number, because it can be changed into a prime (1253135591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6459365 + ... + 6459558.

It is an arithmetic number, because the mean of its divisors is an integer number (316513638).

Almost surely, 2^1253135531 is an apocalyptic number.

1253135531 is a deficient number, since it is larger than the sum of its proper divisors (12919021).

1253135531 is an equidigital number, since it uses as much as digits as its factorization.

1253135531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12919020.

The product of its digits is 6750, while the sum is 29.

The square root of 1253135531 is about 35399.6543909683. The cubic root of 1253135531 is about 1078.1172991802.

The spelling of 1253135531 in words is "one billion, two hundred fifty-three million, one hundred thirty-five thousand, five hundred thirty-one".