97804921 has 2 divisors, whose sum is σ = 97804922. Its totient is φ = 97804920.

The previous prime is 97804897. The next prime is 97804933. The reversal of 97804921 is 12940879.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89510521 + 8294400 = 9461^2 + 2880^2 .

It is a cyclic number.

It is not a de Polignac number, because 97804921 - 2¹⁹ = 97280633 is a prime.

It is not a weakly prime, because it can be changed into another prime (97805921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48902460 + 48902461.

It is an arithmetic number, because the mean of its divisors is an integer number (48902461).

Almost surely, 2^97804921 is an apocalyptic number.

It is an amenable number.

97804921 is a deficient number, since it is larger than the sum of its proper divisors (1).

97804921 is an equidigital number, since it uses as much as digits as its factorization.

97804921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 97804921 is about 9889.6370509741. The cubic root of 97804921 is about 460.7375078642.

The spelling of 97804921 in words is "ninety-seven million, eight hundred four thousand, nine hundred twenty-one".