89791209 has 6 divisors (see below), whose sum is σ = 129698426. Its totient is φ = 59860800.

The previous prime is 89791183. The next prime is 89791211. The reversal of 89791209 is 90219798.

It can be written as a sum of positive squares in only one way, i.e., 56475225 + 33315984 = 7515^2 + 5772^2 .

It is not a de Polignac number, because 89791209 - 2¹³ = 89783017 is a prime.

It is a super-2 number, since 2×89791209² = 16124922427363362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (89741209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4988392 + ... + 4988409.

Almost surely, 2^89791209 is an apocalyptic number.

It is an amenable number.

89791209 is a deficient number, since it is larger than the sum of its proper divisors (39907217).

89791209 is a wasteful number, since it uses less digits than its factorization.

89791209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9976807 (or 9976804 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 89791209 is about 9475.8223389846. The cubic root of 89791209 is about 447.7936592959.

It can be divided in two parts, 89791 and 209, that added together give a square (90000 = 300²).

The spelling of 89791209 in words is "eighty-nine million, seven hundred ninety-one thousand, two hundred nine".