1641711972 has 24 divisors (see below), whose sum is σ = 3843147616. Its totient is φ = 545453568.

The previous prime is 1641711959. The next prime is 1641711979. The reversal of 1641711972 is 2791171461.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1641711972.

It is not an unprimeable number, because it can be changed into a prime (1641711979) 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, 219133 + ... + 226500.

Almost surely, 2^1641711972 is an apocalyptic number.

1641711972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1641711972 is an abundant number, since it is smaller than the sum of its proper divisors (2201435644).

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

1641711972 is a wasteful number, since it uses less digits than its factorization.

1641711972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445947 (or 445945 counting only the distinct ones).

The product of its digits is 21168, while the sum is 39.

The square root of 1641711972 is about 40518.0450170045. The cubic root of 1641711972 is about 1179.6839074821.

The spelling of 1641711972 in words is "one billion, six hundred forty-one million, seven hundred eleven thousand, nine hundred seventy-two".