920190091 has 2 divisors, whose sum is σ = 920190092. Its totient is φ = 920190090.

The previous prime is 920190071. The next prime is 920190107. The reversal of 920190091 is 190091029.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 920190091 - 2⁹ = 920189579 is a prime.

It is a plaindrome in base 9.

It is not a weakly prime, because it can be changed into another prime (920190001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460095045 + 460095046.

It is an arithmetic number, because the mean of its divisors is an integer number (460095046).

Almost surely, 2^920190091 is an apocalyptic number.

920190091 is a deficient number, since it is larger than the sum of its proper divisors (1).

920190091 is an equidigital number, since it uses as much as digits as its factorization.

920190091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 920190091 is about 30334.6351716977. The cubic root of 920190091 is about 972.6558072517.

The spelling of 920190091 in words is "nine hundred twenty million, one hundred ninety thousand, ninety-one".