90909143291 has 4 divisors (see below), whose sum is σ = 91385107584. Its totient is φ = 90433179000.

The previous prime is 90909143287. The next prime is 90909143317. The reversal of 90909143291 is 19234190909.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19234190909 = 79 ⋅243470771.

It is a cyclic number.

It is not a de Polignac number, because 90909143291 - 2² = 90909143287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90909143261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237981860 + ... + 237982241.

It is an arithmetic number, because the mean of its divisors is an integer number (22846276896).

Almost surely, 2^90909143291 is an apocalyptic number.

90909143291 is a deficient number, since it is larger than the sum of its proper divisors (475964293).

90909143291 is a wasteful number, since it uses less digits than its factorization.

90909143291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475964292.

The product of its (nonzero) digits is 157464, while the sum is 47.

The spelling of 90909143291 in words is "ninety billion, nine hundred nine million, one hundred forty-three thousand, two hundred ninety-one".