1651231272 has 32 divisors (see below), whose sum is σ = 4307561280. Its totient is φ = 526479360.

The previous prime is 1651231259. The next prime is 1651231279. The reversal of 1651231272 is 2721321561.

It is not an unprimeable number, because it can be changed into a prime (1651231279) 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, 1495129 + ... + 1496232.

It is an arithmetic number, because the mean of its divisors is an integer number (134611290).

Almost surely, 2^1651231272 is an apocalyptic number.

1651231272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1651231272 is an abundant number, since it is smaller than the sum of its proper divisors (2656330008).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1651231272 is a wasteful number, since it uses less digits than its factorization.

1651231272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2991393 (or 2991389 counting only the distinct ones).

The product of its digits is 5040, while the sum is 30.

The square root of 1651231272 is about 40635.3451074308. The cubic root of 1651231272 is about 1181.9596070724.

The spelling of 1651231272 in words is "one billion, six hundred fifty-one million, two hundred thirty-one thousand, two hundred seventy-two".