197551 has 2 divisors, whose sum is σ = 197552. Its totient is φ = 197550.

The previous prime is 197539. The next prime is 197567. The reversal of 197551 is 155791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 197551 - 2⁷ = 197423 is a prime.

It is a Chen prime.

It is an Ulam number.

197551 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98775 + 98776.

It is an arithmetic number, because the mean of its divisors is an integer number (98776).

2¹⁹⁷⁵⁵¹ is an apocalyptic number.

197551 is a deficient number, since it is larger than the sum of its proper divisors (1).

197551 is an equidigital number, since it uses as much as digits as its factorization.

197551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1575, while the sum is 28.

The square root of 197551 is about 444.4670966450. The cubic root of 197551 is about 58.2406764843.

The spelling of 197551 in words is "one hundred ninety-seven thousand, five hundred fifty-one".