1221453925 has 6 divisors (see below), whose sum is σ = 1514602898. Its totient is φ = 977163120.

The previous prime is 1221453913. The next prime is 1221453943. The reversal of 1221453925 is 5293541221.

It can be written as a sum of positive squares in 3 ways, for example, as 19236996 + 1202216929 = 4386^2 + 34673^2 .

It is not a de Polignac number, because 1221453925 - 2⁷ = 1221453797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24429054 + ... + 24429103.

Almost surely, 2^1221453925 is an apocalyptic number.

It is an amenable number.

1221453925 is a deficient number, since it is larger than the sum of its proper divisors (293148973).

1221453925 is an equidigital number, since it uses as much as digits as its factorization.

1221453925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48858167 (or 48858162 counting only the distinct ones).

The product of its digits is 21600, while the sum is 34.

The square root of 1221453925 is about 34949.3050717750. The cubic root of 1221453925 is about 1068.9540321565.

The spelling of 1221453925 in words is "one billion, two hundred twenty-one million, four hundred fifty-three thousand, nine hundred twenty-five".