722172145 has 4 divisors (see below), whose sum is σ = 866606580. Its totient is φ = 577737712.

The previous prime is 722172131. The next prime is 722172151. The reversal of 722172145 is 541271227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 541271227 = 7 ⋅77324461.

It can be written as a sum of positive squares in 2 ways, for example, as 367565584 + 354606561 = 19172^2 + 18831^2 .

It is a cyclic number.

It is not a de Polignac number, because 722172145 - 2⁹ = 722171633 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72217210 + ... + 72217219.

It is an arithmetic number, because the mean of its divisors is an integer number (216651645).

Almost surely, 2^722172145 is an apocalyptic number.

It is an amenable number.

722172145 is a deficient number, since it is larger than the sum of its proper divisors (144434435).

722172145 is a wasteful number, since it uses less digits than its factorization.

722172145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144434434.

The product of its digits is 7840, while the sum is 31.

The square root of 722172145 is about 26873.2607809324. The cubic root of 722172145 is about 897.1813648942.

The spelling of 722172145 in words is "seven hundred twenty-two million, one hundred seventy-two thousand, one hundred forty-five".