90759989 has 2 divisors, whose sum is σ = 90759990. Its totient is φ = 90759988.

The previous prime is 90759967. The next prime is 90760027. The reversal of 90759989 is 98995709.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66178225 + 24581764 = 8135^2 + 4958^2 .

It is a cyclic number.

It is not a de Polignac number, because 90759989 - 2¹² = 90755893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90759959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45379994 + 45379995.

It is an arithmetic number, because the mean of its divisors is an integer number (45379995).

Almost surely, 2^90759989 is an apocalyptic number.

It is an amenable number.

90759989 is a deficient number, since it is larger than the sum of its proper divisors (1).

90759989 is an equidigital number, since it uses as much as digits as its factorization.

90759989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1837080, while the sum is 56.

The square root of 90759989 is about 9526.8037137332. The cubic root of 90759989 is about 449.3983548130.

The spelling of 90759989 in words is "ninety million, seven hundred fifty-nine thousand, nine hundred eighty-nine".