1225863311 has 4 divisors (see below), whose sum is σ = 1226626800. Its totient is φ = 1225099824.

The previous prime is 1225863281. The next prime is 1225863329. The reversal of 1225863311 is 1133685221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1133685221 = 31 ⋅36570491.

It is a cyclic number.

It is not a de Polignac number, because 1225863311 - 2¹⁴ = 1225846927 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 (1225863371) 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, 379331 + ... + 382548.

It is an arithmetic number, because the mean of its divisors is an integer number (306656700).

Almost surely, 2^1225863311 is an apocalyptic number.

1225863311 is a deficient number, since it is larger than the sum of its proper divisors (763489).

1225863311 is an equidigital number, since it uses as much as digits as its factorization.

1225863311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763488.

The product of its digits is 8640, while the sum is 32.

The square root of 1225863311 is about 35012.3308421476. The cubic root of 1225863311 is about 1070.2387771770.

The spelling of 1225863311 in words is "one billion, two hundred twenty-five million, eight hundred sixty-three thousand, three hundred eleven".