197958457 has 2 divisors, whose sum is σ = 197958458. Its totient is φ = 197958456.

The previous prime is 197958443. The next prime is 197958461. The reversal of 197958457 is 754859791.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176252176 + 21706281 = 13276^2 + 4659^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197958457 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 197958398 and 197958407.

It is not a weakly prime, because it can be changed into another prime (197958487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98979228 + 98979229.

It is an arithmetic number, because the mean of its divisors is an integer number (98979229).

Almost surely, 2^197958457 is an apocalyptic number.

It is an amenable number.

197958457 is a deficient number, since it is larger than the sum of its proper divisors (1).

197958457 is an equidigital number, since it uses as much as digits as its factorization.

197958457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3175200, while the sum is 55.

The square root of 197958457 is about 14069.7710358058. The cubic root of 197958457 is about 582.8069024425.

The spelling of 197958457 in words is "one hundred ninety-seven million, nine hundred fifty-eight thousand, four hundred fifty-seven".