1091381251 has 2 divisors, whose sum is σ = 1091381252. Its totient is φ = 1091381250.

The previous prime is 1091381243. The next prime is 1091381281. The reversal of 1091381251 is 1521831901.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1091381251 - 2³ = 1091381243 is a prime.

It is a super-2 number, since 2×1091381251² = 2382226070068650002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1091381201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545690625 + 545690626.

It is an arithmetic number, because the mean of its divisors is an integer number (545690626).

Almost surely, 2^1091381251 is an apocalyptic number.

1091381251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091381251 is an equidigital number, since it uses as much as digits as its factorization.

1091381251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 1091381251 is about 33036.0598588875. The cubic root of 1091381251 is about 1029.5769938005.

The spelling of 1091381251 in words is "one billion, ninety-one million, three hundred eighty-one thousand, two hundred fifty-one".