1188921425 has 6 divisors (see below), whose sum is σ = 1474262598. Its totient is φ = 951137120.

The previous prime is 1188921389. The next prime is 1188921427. The reversal of 1188921425 is 5241298811.

It can be written as a sum of positive squares in 3 ways, for example, as 246615616 + 942305809 = 15704^2 + 30697^2 .

It is not a de Polignac number, because 1188921425 - 2¹² = 1188917329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1188921427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23778404 + ... + 23778453.

It is an arithmetic number, because the mean of its divisors is an integer number (245710433).

Almost surely, 2^1188921425 is an apocalyptic number.

It is an amenable number.

1188921425 is a deficient number, since it is larger than the sum of its proper divisors (285341173).

1188921425 is an equidigital number, since it uses as much as digits as its factorization.

1188921425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47556867 (or 47556862 counting only the distinct ones).

The product of its digits is 46080, while the sum is 41.

The square root of 1188921425 is about 34480.7399137548. The cubic root of 1188921425 is about 1059.3782472788.

The spelling of 1188921425 in words is "one billion, one hundred eighty-eight million, nine hundred twenty-one thousand, four hundred twenty-five".