90900000869 has 2 divisors, whose sum is σ = 90900000870. Its totient is φ = 90900000868.

The previous prime is 90900000853. The next prime is 90900001019. The reversal of 90900000869 is 96800000909.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64483999969 + 26416000900 = 253937^2 + 162530^2 .

It is a cyclic number.

It is not a de Polignac number, because 90900000869 - 2⁴ = 90900000853 is a prime.

It is a super-2 number, since 2×90900000869² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90900008869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45450000434 + 45450000435.

It is an arithmetic number, because the mean of its divisors is an integer number (45450000435).

Almost surely, 2^90900000869 is an apocalyptic number.

It is an amenable number.

90900000869 is a deficient number, since it is larger than the sum of its proper divisors (1).

90900000869 is an equidigital number, since it uses as much as digits as its factorization.

90900000869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 41.

The spelling of 90900000869 in words is "ninety billion, nine hundred million, eight hundred sixty-nine", and thus it is an aban number.