90220397 has 2 divisors, whose sum is σ = 90220398. Its totient is φ = 90220396.

The previous prime is 90220373. The next prime is 90220433. The reversal of 90220397 is 79302209.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85636516 + 4583881 = 9254^2 + 2141^2 .

It is a cyclic number.

It is not a de Polignac number, because 90220397 - 2¹⁰ = 90219373 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90220327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45110198 + 45110199.

It is an arithmetic number, because the mean of its divisors is an integer number (45110199).

Almost surely, 2^90220397 is an apocalyptic number.

It is an amenable number.

90220397 is a deficient number, since it is larger than the sum of its proper divisors (1).

90220397 is an equidigital number, since it uses as much as digits as its factorization.

90220397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 90220397 is about 9498.4418195828. The cubic root of 90220397 is about 448.5059868860.

The spelling of 90220397 in words is "ninety million, two hundred twenty thousand, three hundred ninety-seven".