1125651621 has 4 divisors (see below), whose sum is σ = 1500868832. Its totient is φ = 750434412.

The previous prime is 1125651589. The next prime is 1125651623. The reversal of 1125651621 is 1261565211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1125651621 - 2⁵ = 1125651589 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 (1125651623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187608601 + ... + 187608606.

It is an arithmetic number, because the mean of its divisors is an integer number (375217208).

Almost surely, 2^1125651621 is an apocalyptic number.

It is an amenable number.

1125651621 is a deficient number, since it is larger than the sum of its proper divisors (375217211).

1125651621 is an equidigital number, since it uses as much as digits as its factorization.

1125651621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375217210.

The product of its digits is 3600, while the sum is 30.

The square root of 1125651621 is about 33550.7320486454. The cubic root of 1125651621 is about 1040.2426766651.

The spelling of 1125651621 in words is "one billion, one hundred twenty-five million, six hundred fifty-one thousand, six hundred twenty-one".