1000890391 has 2 divisors, whose sum is σ = 1000890392. Its totient is φ = 1000890390.

The previous prime is 1000890389. The next prime is 1000890413. The reversal of 1000890391 is 1930980001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1000890391 - 2¹ = 1000890389 is a prime.

It is a super-2 number, since 2×1000890391² = 2003563149592265762, which contains 22 as substring.

Together with 1000890389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000890301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500445195 + 500445196.

It is an arithmetic number, because the mean of its divisors is an integer number (500445196).

Almost surely, 2^1000890391 is an apocalyptic number.

1000890391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000890391 is an equidigital number, since it uses as much as digits as its factorization.

1000890391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 1000890391 is about 31636.8517871169. The cubic root of 1000890391 is about 1000.2967089551.

The spelling of 1000890391 in words is "one billion, eight hundred ninety thousand, three hundred ninety-one".