90180901 has 2 divisors, whose sum is σ = 90180902. Its totient is φ = 90180900.

The previous prime is 90180899. The next prime is 90180947. The reversal of 90180901 is 10908109.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84658401 + 5522500 = 9201^2 + 2350^2 .

It is a cyclic number.

It is not a de Polignac number, because 90180901 - 2¹ = 90180899 is a prime.

Together with 90180899, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 90180901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90180301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45090450 + 45090451.

It is an arithmetic number, because the mean of its divisors is an integer number (45090451).

Almost surely, 2^90180901 is an apocalyptic number.

It is an amenable number.

90180901 is a deficient number, since it is larger than the sum of its proper divisors (1).

90180901 is an equidigital number, since it uses as much as digits as its factorization.

90180901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 90180901 is about 9496.3625141419. The cubic root of 90180901 is about 448.4405294854.

The spelling of 90180901 in words is "ninety million, one hundred eighty thousand, nine hundred one".