1651647372 has 48 divisors (see below), whose sum is σ = 3949102080. Its totient is φ = 536977728.

The previous prime is 1651647367. The next prime is 1651647377. The reversal of 1651647372 is 2737461561.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1651647367) and next prime (1651647377).

It is not an unprimeable number, because it can be changed into a prime (1651647377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 443454 + ... + 447162.

It is an arithmetic number, because the mean of its divisors is an integer number (82272960).

Almost surely, 2^1651647372 is an apocalyptic number.

1651647372 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1651647372 is an abundant number, since it is smaller than the sum of its proper divisors (2297454708).

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

1651647372 is a wasteful number, since it uses less digits than its factorization.

1651647372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4622 (or 4620 counting only the distinct ones).

The product of its digits is 211680, while the sum is 42.

The square root of 1651647372 is about 40640.4647119100. The cubic root of 1651647372 is about 1182.0588808882.

The spelling of 1651647372 in words is "one billion, six hundred fifty-one million, six hundred forty-seven thousand, three hundred seventy-two".