90861019 has 2 divisors, whose sum is σ = 90861020. Its totient is φ = 90861018.

The previous prime is 90860989. The next prime is 90861041. The reversal of 90861019 is 91016809.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90861019 - 2¹⁹ = 90336731 is a prime.

It is a super-2 number, since 2×90861019² = 16511449547436722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90861319) 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, 45430509 + 45430510.

It is an arithmetic number, because the mean of its divisors is an integer number (45430510).

Almost surely, 2^90861019 is an apocalyptic number.

90861019 is a deficient number, since it is larger than the sum of its proper divisors (1).

90861019 is an equidigital number, since it uses as much as digits as its factorization.

90861019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 90861019 is about 9532.1046469287. The cubic root of 90861019 is about 449.5650430932.

The spelling of 90861019 in words is "ninety million, eight hundred sixty-one thousand, nineteen".