1073051991 has 24 divisors (see below), whose sum is σ = 1695067920. Its totient is φ = 648720000.

The previous prime is 1073051989. The next prime is 1073052007. The reversal of 1073051991 is 1991503701.

1073051991 is a `hidden beast` number, since 107 + 30 + 519 + 9 + 1 = 666.

It is not a de Polignac number, because 1073051991 - 2¹ = 1073051989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1073051981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27241 + ... + 53741.

It is an arithmetic number, because the mean of its divisors is an integer number (70627830).

Almost surely, 2^1073051991 is an apocalyptic number.

1073051991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1073051991 is a deficient number, since it is larger than the sum of its proper divisors (622015929).

1073051991 is a wasteful number, since it uses less digits than its factorization.

1073051991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26927 (or 26924 counting only the distinct ones).

The product of its (nonzero) digits is 8505, while the sum is 36.

The square root of 1073051991 is about 32757.4722925930. The cubic root of 1073051991 is about 1023.7806610164.

The spelling of 1073051991 in words is "one billion, seventy-three million, fifty-one thousand, nine hundred ninety-one".