97021989 has 8 divisors (see below), whose sum is σ = 143736320. Its totient is φ = 64681308.

The previous prime is 97021957. The next prime is 97021993. The reversal of 97021989 is 98912079.

It is not a de Polignac number, because 97021989 - 2⁵ = 97021957 is a prime.

It is a super-2 number, since 2×97021989² = 18826532699032242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97028989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1796677 + ... + 1796730.

It is an arithmetic number, because the mean of its divisors is an integer number (17967040).

Almost surely, 2^97021989 is an apocalyptic number.

It is an amenable number.

97021989 is a deficient number, since it is larger than the sum of its proper divisors (46714331).

97021989 is a wasteful number, since it uses less digits than its factorization.

97021989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3593416 (or 3593410 counting only the distinct ones).

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

The square root of 97021989 is about 9849.9740608796. The cubic root of 97021989 is about 459.5048057996.

The spelling of 97021989 in words is "ninety-seven million, twenty-one thousand, nine hundred eighty-nine".