90231653849 has 4 divisors (see below), whose sum is σ = 90244819764. Its totient is φ = 90218487936.

The previous prime is 90231653819. The next prime is 90231653867. The reversal of 90231653849 is 94835613209.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94835613209 = 521 ⋅182026129.

It can be written as a sum of positive squares in 2 ways, for example, as 14514225625 + 75717428224 = 120475^2 + 275168^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90231653849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90231653797 and 90231653806.

It is not an unprimeable number, because it can be changed into a prime (90231653819) 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 in 3 ways as a sum of consecutive naturals, for example, 6572672 + ... + 6586385.

It is an arithmetic number, because the mean of its divisors is an integer number (22561204941).

Almost surely, 2^90231653849 is an apocalyptic number.

It is an amenable number.

90231653849 is a deficient number, since it is larger than the sum of its proper divisors (13165915).

90231653849 is a wasteful number, since it uses less digits than its factorization.

90231653849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13165914.

The product of its (nonzero) digits is 1399680, while the sum is 50.

The spelling of 90231653849 in words is "ninety billion, two hundred thirty-one million, six hundred fifty-three thousand, eight hundred forty-nine".