1125687321 has 96 divisors (see below), whose sum is σ = 1948907520. Its totient is φ = 640332000.

The previous prime is 1125687313. The next prime is 1125687377. The reversal of 1125687321 is 1237865211.

1125687321 is a `hidden beast` number, since 1 + 1 + 2 + 568 + 73 + 21 = 666.

It is not a de Polignac number, because 1125687321 - 2³ = 1125687313 is a prime.

Its product of digits (20160) is a multiple of the sum of its prime factors (336).

It is not an unprimeable number, because it can be changed into a prime (1125687421) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5334906 + ... + 5335116.

It is an arithmetic number, because the mean of its divisors is an integer number (20301120).

Almost surely, 2^1125687321 is an apocalyptic number.

1125687321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1125687321 is a deficient number, since it is larger than the sum of its proper divisors (823220199).

1125687321 is a wasteful number, since it uses less digits than its factorization.

1125687321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336 (or 319 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 1125687321 is about 33551.2640745472. The cubic root of 1125687321 is about 1040.2536736350.

The spelling of 1125687321 in words is "one billion, one hundred twenty-five million, six hundred eighty-seven thousand, three hundred twenty-one".