1051999657 has 16 divisors (see below), whose sum is σ = 1121472000. Its totient is φ = 984006144.

The previous prime is 1051999649. The next prime is 1051999747. The reversal of 1051999657 is 7569991501.

It is a cyclic number.

It is not a de Polignac number, because 1051999657 - 2³ = 1051999649 is a prime.

It is a super-2 number, since 2×1051999657² = 2213406556656235298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1051999057) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 730344 + ... + 731782.

It is an arithmetic number, because the mean of its divisors is an integer number (70092000).

Almost surely, 2^1051999657 is an apocalyptic number.

It is an amenable number.

1051999657 is a deficient number, since it is larger than the sum of its proper divisors (69472343).

1051999657 is a wasteful number, since it uses less digits than its factorization.

1051999657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920.

The product of its (nonzero) digits is 765450, while the sum is 52.

The square root of 1051999657 is about 32434.5441928818. The cubic root of 1051999657 is about 1017.0411680001.

The spelling of 1051999657 in words is "one billion, fifty-one million, nine hundred ninety-nine thousand, six hundred fifty-seven".