197651 has 2 divisors, whose sum is σ = 197652. Its totient is φ = 197650.

The previous prime is 197647. The next prime is 197677. The reversal of 197651 is 156791.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 197651 - 2² = 197647 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (197621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98825 + 98826.

It is an arithmetic number, because the mean of its divisors is an integer number (98826).

2¹⁹⁷⁶⁵¹ is an apocalyptic number.

197651 is a deficient number, since it is larger than the sum of its proper divisors (1).

197651 is an equidigital number, since it uses as much as digits as its factorization.

197651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1890, while the sum is 29.

The square root of 197651 is about 444.5795766789. The cubic root of 197651 is about 58.2505019390.

It can be divided in two parts, 197 and 651, that added together give a palindrome (848).

The spelling of 197651 in words is "one hundred ninety-seven thousand, six hundred fifty-one".