1225251311 has 4 divisors (see below), whose sum is σ = 1243538712. Its totient is φ = 1206963912.

The previous prime is 1225251299. The next prime is 1225251317. The reversal of 1225251311 is 1131525221.

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-1225251311 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 (1225251317) 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, 9143600 + ... + 9143733.

It is an arithmetic number, because the mean of its divisors is an integer number (310884678).

Almost surely, 2^1225251311 is an apocalyptic number.

1225251311 is a deficient number, since it is larger than the sum of its proper divisors (18287401).

1225251311 is an equidigital number, since it uses as much as digits as its factorization.

1225251311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18287400.

The product of its digits is 600, while the sum is 23.

The square root of 1225251311 is about 35003.5899730299. The cubic root of 1225251311 is about 1070.0606455276.

Adding to 1225251311 its reverse (1131525221), we get a palindrome (2356776532).

The spelling of 1225251311 in words is "one billion, two hundred twenty-five million, two hundred fifty-one thousand, three hundred eleven".