1287172322 has 18 divisors (see below), whose sum is σ = 2020185867. Its totient is φ = 615046036.

The previous prime is 1287172321. The next prime is 1287172349. The reversal of 1287172322 is 2232717821.

It can be written as a sum of positive squares in only one way, i.e., 643586161 + 643586161 = 25369^2 + 25369^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=25369.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1287172321) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1166423 + ... + 1167525.

Almost surely, 2^1287172322 is an apocalyptic number.

1287172322 is a deficient number, since it is larger than the sum of its proper divisors (733013545).

1287172322 is an frugal number, since it uses more digits than its factorization.

1287172322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2254 (or 1128 counting only the distinct ones).

The product of its digits is 18816, while the sum is 35.

The square root of 1287172322 is about 35877.1838638430. The cubic root of 1287172322 is about 1087.7912577341.

The spelling of 1287172322 in words is "one billion, two hundred eighty-seven million, one hundred seventy-two thousand, three hundred twenty-two".