90909143287 has 2 divisors, whose sum is σ = 90909143288. Its totient is φ = 90909143286.

The previous prime is 90909143263. The next prime is 90909143317. The reversal of 90909143287 is 78234190909.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90909143287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90909143387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45454571643 + 45454571644.

It is an arithmetic number, because the mean of its divisors is an integer number (45454571644).

Almost surely, 2^90909143287 is an apocalyptic number.

90909143287 is a deficient number, since it is larger than the sum of its proper divisors (1).

90909143287 is an equidigital number, since it uses as much as digits as its factorization.

90909143287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 979776, while the sum is 52.

The spelling of 90909143287 in words is "ninety billion, nine hundred nine million, one hundred forty-three thousand, two hundred eighty-seven".