197722879 has 2 divisors, whose sum is σ = 197722880. Its totient is φ = 197722878.

The previous prime is 197722831. The next prime is 197722883. The reversal of 197722879 is 978227791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 197722879 - 2¹⁵ = 197690111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197722579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98861439 + 98861440.

It is an arithmetic number, because the mean of its divisors is an integer number (98861440).

Almost surely, 2^197722879 is an apocalyptic number.

197722879 is a deficient number, since it is larger than the sum of its proper divisors (1).

197722879 is an equidigital number, since it uses as much as digits as its factorization.

197722879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 889056, while the sum is 52.

The square root of 197722879 is about 14061.3967656133. The cubic root of 197722879 is about 582.5756233057.

The spelling of 197722879 in words is "one hundred ninety-seven million, seven hundred twenty-two thousand, eight hundred seventy-nine".