90824392981 has 4 divisors (see below), whose sum is σ = 103799306272. Its totient is φ = 77849479692.

The previous prime is 90824392963. The next prime is 90824393003. The reversal of 90824392981 is 18929342809.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18929342809 = 13 ⋅1456103293.

It is a cyclic number.

It is not a de Polignac number, because 90824392981 - 2⁵ = 90824392949 is a prime.

It is a super-4 number, since 4×90824392981⁴ (a number of 45 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90824392381) 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, 6487456635 + ... + 6487456648.

It is an arithmetic number, because the mean of its divisors is an integer number (25949826568).

Almost surely, 2^90824392981 is an apocalyptic number.

It is an amenable number.

90824392981 is a deficient number, since it is larger than the sum of its proper divisors (12974913291).

90824392981 is a wasteful number, since it uses less digits than its factorization.

90824392981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12974913290.

The product of its (nonzero) digits is 2239488, while the sum is 55.

The spelling of 90824392981 in words is "ninety billion, eight hundred twenty-four million, three hundred ninety-two thousand, nine hundred eighty-one".