90813497 has 2 divisors, whose sum is σ = 90813498. Its totient is φ = 90813496.

The previous prime is 90813479. The next prime is 90813551. The reversal of 90813497 is 79431809.

It is a happy number.

Together with previous prime (90813479) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78570496 + 12243001 = 8864^2 + 3499^2 .

It is an emirp because it is prime and its reverse (79431809) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90813497 - 2¹² = 90809401 is a prime.

It is not a weakly prime, because it can be changed into another prime (90813427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45406748 + 45406749.

It is an arithmetic number, because the mean of its divisors is an integer number (45406749).

Almost surely, 2^90813497 is an apocalyptic number.

It is an amenable number.

90813497 is a deficient number, since it is larger than the sum of its proper divisors (1).

90813497 is an equidigital number, since it uses as much as digits as its factorization.

90813497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 90813497 is about 9529.6115870480. The cubic root of 90813497 is about 449.4866524701.

The spelling of 90813497 in words is "ninety million, eight hundred thirteen thousand, four hundred ninety-seven".