90450401 has 2 divisors, whose sum is σ = 90450402. Its totient is φ = 90450400.

The previous prime is 90450389. The next prime is 90450403. The reversal of 90450401 is 10405409.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77018176 + 13432225 = 8776^2 + 3665^2 .

It is a cyclic number.

It is not a de Polignac number, because 90450401 - 2¹⁰ = 90449377 is a prime.

It is a Sophie Germain prime.

Together with 90450403, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (90450403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45225200 + 45225201.

It is an arithmetic number, because the mean of its divisors is an integer number (45225201).

Almost surely, 2^90450401 is an apocalyptic number.

It is an amenable number.

90450401 is a deficient number, since it is larger than the sum of its proper divisors (1).

90450401 is an equidigital number, since it uses as much as digits as its factorization.

90450401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 90450401 is about 9510.5415723817. The cubic root of 90450401 is about 448.8867974198.

The spelling of 90450401 in words is "ninety million, four hundred fifty thousand, four hundred one".