90888401 has 2 divisors, whose sum is σ = 90888402. Its totient is φ = 90888400.

The previous prime is 90888397. The next prime is 90888437. The reversal of 90888401 is 10488809.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90250000 + 638401 = 9500^2 + 799^2 .

It is an emirp because it is prime and its reverse (10488809) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90888401 - 2² = 90888397 is a prime.

It is not a weakly prime, because it can be changed into another prime (90888101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45444200 + 45444201.

It is an arithmetic number, because the mean of its divisors is an integer number (45444201).

Almost surely, 2^90888401 is an apocalyptic number.

It is an amenable number.

90888401 is a deficient number, since it is larger than the sum of its proper divisors (1).

90888401 is an equidigital number, since it uses as much as digits as its factorization.

90888401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 90888401 is about 9533.5408427299. The cubic root of 90888401 is about 449.6101990680.

The spelling of 90888401 in words is "ninety million, eight hundred eighty-eight thousand, four hundred one".