1051999 has 4 divisors (see below), whose sum is σ = 1132936. Its totient is φ = 971064.

The previous prime is 1051991. The next prime is 1052027. The reversal of 1051999 is 9991501.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1051999 - 2³ = 1051991 is a prime.

It is a super-2 number, since 2×1051999² = 2213403792002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1051991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40449 + ... + 40474.

It is an arithmetic number, because the mean of its divisors is an integer number (283234).

2^1051999 is an apocalyptic number.

1051999 is a deficient number, since it is larger than the sum of its proper divisors (80937).

1051999 is an equidigital number, since it uses as much as digits as its factorization.

1051999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80936.

The product of its (nonzero) digits is 3645, while the sum is 34.

The square root of 1051999 is about 1025.6700249105. The cubic root of 1051999 is about 101.7040956278.

The spelling of 1051999 in words is "one million, fifty-one thousand, nine hundred ninety-nine".