1225401253 has 4 divisors (see below), whose sum is σ = 1226704428. Its totient is φ = 1224098080.

The previous prime is 1225401227. The next prime is 1225401277. The reversal of 1225401253 is 3521045221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3521045221 = 1783 ⋅1974787.

It can be written as a sum of positive squares in 2 ways, for example, as 807525889 + 417875364 = 28417^2 + 20442^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1225401253 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 (1225401053) 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, 650176 + ... + 652057.

It is an arithmetic number, because the mean of its divisors is an integer number (306676107).

Almost surely, 2^1225401253 is an apocalyptic number.

It is an amenable number.

1225401253 is a deficient number, since it is larger than the sum of its proper divisors (1303175).

1225401253 is an equidigital number, since it uses as much as digits as its factorization.

1225401253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1303174.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1225401253 is about 35005.7317163918. The cubic root of 1225401253 is about 1070.1042938490.

Adding to 1225401253 its reverse (3521045221), we get a palindrome (4746446474).

The spelling of 1225401253 in words is "one billion, two hundred twenty-five million, four hundred one thousand, two hundred fifty-three".