90999959 has 2 divisors, whose sum is σ = 90999960. Its totient is φ = 90999958.

The previous prime is 90999947. The next prime is 90999971. The reversal of 90999959 is 95999909.

It is a balanced prime because it is at equal distance from previous prime (90999947) and next prime (90999971).

It is a cyclic number.

It is not a de Polignac number, because 90999959 - 2¹⁶ = 90934423 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 90999898 and 90999907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90999989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45499979 + 45499980.

It is an arithmetic number, because the mean of its divisors is an integer number (45499980).

Almost surely, 2^90999959 is an apocalyptic number.

90999959 is a deficient number, since it is larger than the sum of its proper divisors (1).

90999959 is an equidigital number, since it uses as much as digits as its factorization.

90999959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2657205, while the sum is 59.

The square root of 90999959 is about 9539.3898651853. The cubic root of 90999959 is about 449.7940769760.

The spelling of 90999959 in words is "ninety million, nine hundred ninety-nine thousand, nine hundred fifty-nine".