97209987 has 8 divisors (see below), whose sum is σ = 148129536. Its totient is φ = 55548552.

The previous prime is 97209977. The next prime is 97209997. The reversal of 97209987 is 78990279.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (97209977) and next prime (97209997).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 97209987 - 2⁶ = 97209923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (97209907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2314503 + ... + 2314544.

It is an arithmetic number, because the mean of its divisors is an integer number (18516192).

Almost surely, 2^97209987 is an apocalyptic number.

97209987 is a deficient number, since it is larger than the sum of its proper divisors (50919549).

97209987 is a wasteful number, since it uses less digits than its factorization.

97209987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4629057.

The product of its (nonzero) digits is 571536, while the sum is 51.

The square root of 97209987 is about 9859.5125133041. The cubic root of 97209987 is about 459.8014060826.

The spelling of 97209987 in words is "ninety-seven million, two hundred nine thousand, nine hundred eighty-seven".