90999397 has 2 divisors, whose sum is σ = 90999398. Its totient is φ = 90999396.

The previous prime is 90999383. The next prime is 90999407. The reversal of 90999397 is 79399909.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57289761 + 33709636 = 7569^2 + 5806^2 .

It is an emirp because it is prime and its reverse (79399909) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90999397 - 2²³ = 82610789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90999347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45499698 + 45499699.

It is an arithmetic number, because the mean of its divisors is an integer number (45499699).

Almost surely, 2^90999397 is an apocalyptic number.

It is an amenable number.

90999397 is a deficient number, since it is larger than the sum of its proper divisors (1).

90999397 is an equidigital number, since it uses as much as digits as its factorization.

90999397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1240029, while the sum is 55.

The square root of 90999397 is about 9539.3604083293. The cubic root of 90999397 is about 449.7931510240.

It can be divided in two parts, 9099 and 9397, that added together give a square (18496 = 136²).

The spelling of 90999397 in words is "ninety million, nine hundred ninety-nine thousand, three hundred ninety-seven".