90403385549 has 2 divisors, whose sum is σ = 90403385550. Its totient is φ = 90403385548.

The previous prime is 90403385539. The next prime is 90403385561. The reversal of 90403385549 is 94558330409.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85658655625 + 4744729924 = 292675^2 + 68882^2 .

It is an emirp because it is prime and its reverse (94558330409) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90403385549 - 2²⁸ = 90134950093 is a prime.

It is a super-2 number, since 2×90403385549² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 90403385497 and 90403385506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90403385539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45201692774 + 45201692775.

It is an arithmetic number, because the mean of its divisors is an integer number (45201692775).

Almost surely, 2^90403385549 is an apocalyptic number.

It is an amenable number.

90403385549 is a deficient number, since it is larger than the sum of its proper divisors (1).

90403385549 is an equidigital number, since it uses as much as digits as its factorization.

90403385549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2332800, while the sum is 50.

The spelling of 90403385549 in words is "ninety billion, four hundred three million, three hundred eighty-five thousand, five hundred forty-nine".