1253111261 has 4 divisors (see below), whose sum is σ = 1256102400. Its totient is φ = 1250120124.

The previous prime is 1253111239. The next prime is 1253111303. The reversal of 1253111261 is 1621113521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1253111261 - 2²⁶ = 1186002397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1253111861) 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, 1494941 + ... + 1495778.

It is an arithmetic number, because the mean of its divisors is an integer number (314025600).

Almost surely, 2^1253111261 is an apocalyptic number.

It is an amenable number.

1253111261 is a deficient number, since it is larger than the sum of its proper divisors (2991139).

1253111261 is an equidigital number, since it uses as much as digits as its factorization.

1253111261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2991138.

The product of its digits is 360, while the sum is 23.

The square root of 1253111261 is about 35399.3115893516. The cubic root of 1253111261 is about 1078.1103390190.

Adding to 1253111261 its reverse (1621113521), we get a palindrome (2874224782).

The spelling of 1253111261 in words is "one billion, two hundred fifty-three million, one hundred eleven thousand, two hundred sixty-one".