90691143 has 4 divisors (see below), whose sum is σ = 120921528. Its totient is φ = 60460760.

The previous prime is 90691127. The next prime is 90691157. The reversal of 90691143 is 34119609.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34119609 = 3 ⋅11373203.

It is a cyclic number.

It is not a de Polignac number, because 90691143 - 2⁴ = 90691127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90691043) 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, 15115188 + ... + 15115193.

It is an arithmetic number, because the mean of its divisors is an integer number (30230382).

Almost surely, 2^90691143 is an apocalyptic number.

90691143 is a deficient number, since it is larger than the sum of its proper divisors (30230385).

90691143 is a wasteful number, since it uses less digits than its factorization.

90691143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30230384.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 90691143 is about 9523.1897492384. The cubic root of 90691143 is about 449.2846956784.

The spelling of 90691143 in words is "ninety million, six hundred ninety-one thousand, one hundred forty-three".