97649021 has 4 divisors (see below), whose sum is σ = 97699452. Its totient is φ = 97598592.

The previous prime is 97649017. The next prime is 97649023. The reversal of 97649021 is 12094679.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12094679 = 2879 ⋅4201.

It can be written as a sum of positive squares in 2 ways, for example, as 60621796 + 37027225 = 7786^2 + 6085^2 .

It is a cyclic number.

It is not a de Polignac number, because 97649021 - 2² = 97649017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97649023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22190 + ... + 26223.

It is an arithmetic number, because the mean of its divisors is an integer number (24424863).

Almost surely, 2^97649021 is an apocalyptic number.

It is an amenable number.

97649021 is a deficient number, since it is larger than the sum of its proper divisors (50431).

97649021 is a wasteful number, since it uses less digits than its factorization.

97649021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50430.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 97649021 is about 9881.7519195738. The cubic root of 97649021 is about 460.4925741211.

The spelling of 97649021 in words is "ninety-seven million, six hundred forty-nine thousand, twenty-one".