90301548721 has 2 divisors, whose sum is σ = 90301548722. Its totient is φ = 90301548720.

The previous prime is 90301548707. The next prime is 90301548751. The reversal of 90301548721 is 12784510309.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50371518096 + 39930030625 = 224436^2 + 199825^2 .

It is an emirp because it is prime and its reverse (12784510309) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90301548721 is a prime.

It is a super-2 number, since 2×90301548721² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90301548751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45150774360 + 45150774361.

It is an arithmetic number, because the mean of its divisors is an integer number (45150774361).

Almost surely, 2^90301548721 is an apocalyptic number.

It is an amenable number.

90301548721 is a deficient number, since it is larger than the sum of its proper divisors (1).

90301548721 is an equidigital number, since it uses as much as digits as its factorization.

90301548721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 90301548721 in words is "ninety billion, three hundred one million, five hundred forty-eight thousand, seven hundred twenty-one".