90918143 has 2 divisors, whose sum is σ = 90918144. Its totient is φ = 90918142.

The previous prime is 90918137. The next prime is 90918181. The reversal of 90918143 is 34181909.

It is a weak prime.

It is an emirp because it is prime and its reverse (34181909) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90918143 - 2¹⁰ = 90917119 is a prime.

It is a super-2 number, since 2×90918143² = 16532217453136898, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90918043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45459071 + 45459072.

It is an arithmetic number, because the mean of its divisors is an integer number (45459072).

Almost surely, 2^90918143 is an apocalyptic number.

90918143 is a deficient number, since it is larger than the sum of its proper divisors (1).

90918143 is an equidigital number, since it uses as much as digits as its factorization.

90918143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 90918143 is about 9535.1005762918. The cubic root of 90918143 is about 449.6592366717.

The spelling of 90918143 in words is "ninety million, nine hundred eighteen thousand, one hundred forty-three".