1172923221 has 8 divisors (see below), whose sum is σ = 1564066720. Its totient is φ = 781864272.

The previous prime is 1172923217. The next prime is 1172923237. The reversal of 1172923221 is 1223292711.

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

It is not a de Polignac number, because 1172923221 - 2² = 1172923217 is a prime.

It is a super-2 number, since 2×1172923221² = 2751497764722029682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1172923291) 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, 26706 + ... + 55308.

It is an arithmetic number, because the mean of its divisors is an integer number (195508340).

Almost surely, 2^1172923221 is an apocalyptic number.

It is an amenable number.

1172923221 is a deficient number, since it is larger than the sum of its proper divisors (391143499).

1172923221 is a wasteful number, since it uses less digits than its factorization.

1172923221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42275.

The product of its digits is 3024, while the sum is 30.

The square root of 1172923221 is about 34247.9666695703. The cubic root of 1172923221 is about 1054.6050859766.

The spelling of 1172923221 in words is "one billion, one hundred seventy-two million, nine hundred twenty-three thousand, two hundred twenty-one".