97189819 has 2 divisors, whose sum is σ = 97189820. Its totient is φ = 97189818.

The previous prime is 97189793. The next prime is 97189849. The reversal of 97189819 is 91898179.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 97189819 - 2²³ = 88801211 is a prime.

It is a super-2 number, since 2×97189819² = 18891721834505522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (97189849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48594909 + 48594910.

It is an arithmetic number, because the mean of its divisors is an integer number (48594910).

Almost surely, 2^97189819 is an apocalyptic number.

97189819 is a deficient number, since it is larger than the sum of its proper divisors (1).

97189819 is an equidigital number, since it uses as much as digits as its factorization.

97189819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 52.

The square root of 97189819 is about 9858.4896916313. The cubic root of 97189819 is about 459.7696057967.

The spelling of 97189819 in words is "ninety-seven million, one hundred eighty-nine thousand, eight hundred nineteen".