1531228172 has 6 divisors (see below), whose sum is σ = 2679649308. Its totient is φ = 765614084.

The previous prime is 1531228163. The next prime is 1531228187. The reversal of 1531228172 is 2718221351.

It is a super-3 number, since 3×1531228172³ (a number of 29 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 191403518 + ... + 191403525.

It is an arithmetic number, because the mean of its divisors is an integer number (446608218).

Almost surely, 2^1531228172 is an apocalyptic number.

It is an amenable number.

1531228172 is a deficient number, since it is larger than the sum of its proper divisors (1148421136).

1531228172 is a wasteful number, since it uses less digits than its factorization.

1531228172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382807047 (or 382807045 counting only the distinct ones).

The product of its digits is 6720, while the sum is 32.

The square root of 1531228172 is about 39130.9106972991. The cubic root of 1531228172 is about 1152.6035961666.

The spelling of 1531228172 in words is "one billion, five hundred thirty-one million, two hundred twenty-eight thousand, one hundred seventy-two".