197622457 has 2 divisors, whose sum is σ = 197622458. Its totient is φ = 197622456.

The previous prime is 197622449. The next prime is 197622511. The reversal of 197622457 is 754226791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196112016 + 1510441 = 14004^2 + 1229^2 .

It is an emirp because it is prime and its reverse (754226791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 197622457 - 2³ = 197622449 is a prime.

It is not a weakly prime, because it can be changed into another prime (197623457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98811228 + 98811229.

It is an arithmetic number, because the mean of its divisors is an integer number (98811229).

Almost surely, 2^197622457 is an apocalyptic number.

It is an amenable number.

197622457 is a deficient number, since it is larger than the sum of its proper divisors (1).

197622457 is an equidigital number, since it uses as much as digits as its factorization.

197622457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 43.

The square root of 197622457 is about 14057.8254719569. The cubic root of 197622457 is about 582.4769779747.

The spelling of 197622457 in words is "one hundred ninety-seven million, six hundred twenty-two thousand, four hundred fifty-seven".