90231748997 has 8 divisors (see below), whose sum is σ = 102888691416. Its totient is φ = 78391383552.

The previous prime is 90231748993. The next prime is 90231749063. The reversal of 90231748997 is 79984713209.

It is a Cunningham number, because it is equal to 300386²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 13348105156 + 76883643841 = 115534^2 + 277279^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90231748997 - 2² = 90231748993 is a prime.

It is a super-2 number, since 2×90231748997² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90231748993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204144008 + ... + 204144449.

It is an arithmetic number, because the mean of its divisors is an integer number (12861086427).

Almost surely, 2^90231748997 is an apocalyptic number.

It is an amenable number.

90231748997 is a deficient number, since it is larger than the sum of its proper divisors (12656942419).

90231748997 is a wasteful number, since it uses less digits than its factorization.

90231748997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408288487.

The product of its (nonzero) digits is 6858432, while the sum is 59.

The spelling of 90231748997 in words is "ninety billion, two hundred thirty-one million, seven hundred forty-eight thousand, nine hundred ninety-seven".