1051991497 has 2 divisors, whose sum is σ = 1051991498. Its totient is φ = 1051991496.

The previous prime is 1051991491. The next prime is 1051991527. The reversal of 1051991497 is 7941991501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 806787216 + 245204281 = 28404^2 + 15659^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1051991497 is a prime.

It is a super-2 number, since 2×1051991497² = 2213372219520602018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1051991491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 525995748 + 525995749.

It is an arithmetic number, because the mean of its divisors is an integer number (525995749).

Almost surely, 2^1051991497 is an apocalyptic number.

It is an amenable number.

1051991497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1051991497 is an equidigital number, since it uses as much as digits as its factorization.

1051991497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 102060, while the sum is 46.

The square root of 1051991497 is about 32434.4184008285. The cubic root of 1051991497 is about 1017.0385383803.

The spelling of 1051991497 in words is "one billion, fifty-one million, nine hundred ninety-one thousand, four hundred ninety-seven".