489191797 has 2 divisors, whose sum is σ = 489191798. Its totient is φ = 489191796.

The previous prime is 489191767. The next prime is 489191809. The reversal of 489191797 is 797191984.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 487923921 + 1267876 = 22089^2 + 1126^2 .

It is a cyclic number.

It is not a de Polignac number, because 489191797 - 2²⁷ = 354974069 is a prime.

It is a super-2 number, since 2×489191797² = 478617228504178418, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (489191707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244595898 + 244595899.

It is an arithmetic number, because the mean of its divisors is an integer number (244595899).

Almost surely, 2^489191797 is an apocalyptic number.

It is an amenable number.

489191797 is a deficient number, since it is larger than the sum of its proper divisors (1).

489191797 is an equidigital number, since it uses as much as digits as its factorization.

489191797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 55.

The square root of 489191797 is about 22117.6806424182. The cubic root of 489191797 is about 787.9398316338.

The spelling of 489191797 in words is "four hundred eighty-nine million, one hundred ninety-one thousand, seven hundred ninety-seven".