1051999660 has 24 divisors (see below), whose sum is σ = 2218690656. Its totient is φ = 418992000.

The previous prime is 1051999649. The next prime is 1051999747. The reversal of 1051999660 is 669991501.

It is a super-2 number, since 2×1051999660² = 2213406569280231200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1051999660.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108216 + ... + 117535.

It is an arithmetic number, because the mean of its divisors is an integer number (92445444).

Almost surely, 2^1051999660 is an apocalyptic number.

1051999660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1051999660 is an abundant number, since it is smaller than the sum of its proper divisors (1166690996).

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

1051999660 is a wasteful number, since it uses less digits than its factorization.

1051999660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225993 (or 225991 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 46.

The square root of 1051999660 is about 32434.5442391288. The cubic root of 1051999660 is about 1017.0411689669.

The spelling of 1051999660 in words is "one billion, fifty-one million, nine hundred ninety-nine thousand, six hundred sixty".