1051991457 has 32 divisors (see below), whose sum is σ = 1612624896. Its totient is φ = 603768000.

The previous prime is 1051991441. The next prime is 1051991461. The reversal of 1051991457 is 7541991501.

It is a happy number.

It is not a de Polignac number, because 1051991457 - 2⁴ = 1051991441 is a prime.

It is a super-2 number, since 2×1051991457² = 2213372051201965698, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1051991497) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69798 + ... + 83520.

It is an arithmetic number, because the mean of its divisors is an integer number (50394528).

Almost surely, 2^1051991457 is an apocalyptic number.

It is an amenable number.

1051991457 is a deficient number, since it is larger than the sum of its proper divisors (560633439).

1051991457 is a wasteful number, since it uses less digits than its factorization.

1051991457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13861.

The product of its (nonzero) digits is 56700, while the sum is 42.

The square root of 1051991457 is about 32434.4177841995. The cubic root of 1051991457 is about 1017.0385254900.

The spelling of 1051991457 in words is "one billion, fifty-one million, nine hundred ninety-one thousand, four hundred fifty-seven".