90204791 has 2 divisors, whose sum is σ = 90204792. Its totient is φ = 90204790.

The previous prime is 90204743. The next prime is 90204809. The reversal of 90204791 is 19740209.

It is a strong prime.

It is an emirp because it is prime and its reverse (19740209) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90204791 - 2¹⁰ = 90203767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90204721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45102395 + 45102396.

It is an arithmetic number, because the mean of its divisors is an integer number (45102396).

Almost surely, 2^90204791 is an apocalyptic number.

90204791 is a deficient number, since it is larger than the sum of its proper divisors (1).

90204791 is an equidigital number, since it uses as much as digits as its factorization.

90204791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 90204791 is about 9497.6202808914. The cubic root of 90204791 is about 448.4801250769.

The spelling of 90204791 in words is "ninety million, two hundred four thousand, seven hundred ninety-one".