197772457 has 2 divisors, whose sum is σ = 197772458. Its totient is φ = 197772456.

The previous prime is 197772439. The next prime is 197772473. The reversal of 197772457 is 754277791.

197772457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151314601 + 46457856 = 12301^2 + 6816^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197772457 is a prime.

It is a super-2 number, since 2×197772457² = 78227889495633698, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 197772457.

It is not a weakly prime, because it can be changed into another prime (197772857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98886228 + 98886229.

It is an arithmetic number, because the mean of its divisors is an integer number (98886229).

Almost surely, 2^197772457 is an apocalyptic number.

It is an amenable number.

197772457 is a deficient number, since it is larger than the sum of its proper divisors (1).

197772457 is an equidigital number, since it uses as much as digits as its factorization.

197772457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864360, while the sum is 49.

The square root of 197772457 is about 14063.1595667545. The cubic root of 197772457 is about 582.6243118551.

The spelling of 197772457 in words is "one hundred ninety-seven million, seven hundred seventy-two thousand, four hundred fifty-seven".