1051247891 has 2 divisors, whose sum is σ = 1051247892. Its totient is φ = 1051247890.

The previous prime is 1051247881. The next prime is 1051247909. The reversal of 1051247891 is 1987421501.

1051247891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1051247891 - 2¹⁴ = 1051231507 is a prime.

It is a super-2 number, since 2×1051247891² = 2210244256663895762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1051247801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 525623945 + 525623946.

It is an arithmetic number, because the mean of its divisors is an integer number (525623946).

Almost surely, 2^1051247891 is an apocalyptic number.

1051247891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1051247891 is an equidigital number, since it uses as much as digits as its factorization.

1051247891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 38.

The square root of 1051247891 is about 32422.9531505074. The cubic root of 1051247891 is about 1016.7988487934.

The spelling of 1051247891 in words is "one billion, fifty-one million, two hundred forty-seven thousand, eight hundred ninety-one".