1121725913 has 8 divisors (see below), whose sum is σ = 1398515520. Its totient is φ = 874072080.

The previous prime is 1121725873. The next prime is 1121725991. The reversal of 1121725913 is 3195271211.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1121725913 - 2²⁴ = 1104948697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1121725913.

It is not an unprimeable number, because it can be changed into a prime (1121725013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7283858 + ... + 7284011.

It is an arithmetic number, because the mean of its divisors is an integer number (174814440).

Almost surely, 2^1121725913 is an apocalyptic number.

It is an amenable number.

1121725913 is a deficient number, since it is larger than the sum of its proper divisors (276789607).

1121725913 is a wasteful number, since it uses less digits than its factorization.

1121725913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14567887.

The product of its digits is 3780, while the sum is 32.

The square root of 1121725913 is about 33492.1768925222. The cubic root of 1121725913 is about 1039.0319866592.

The spelling of 1121725913 in words is "one billion, one hundred twenty-one million, seven hundred twenty-five thousand, nine hundred thirteen".