154238197 has 2 divisors, whose sum is σ = 154238198. Its totient is φ = 154238196.

The previous prime is 154238179. The next prime is 154238209. The reversal of 154238197 is 791832451.

Together with previous prime (154238179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105042001 + 49196196 = 10249^2 + 7014^2 .

It is a cyclic number.

It is not a de Polignac number, because 154238197 - 2¹¹ = 154236149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154238167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77119098 + 77119099.

It is an arithmetic number, because the mean of its divisors is an integer number (77119099).

Almost surely, 2^154238197 is an apocalyptic number.

It is an amenable number.

154238197 is a deficient number, since it is larger than the sum of its proper divisors (1).

154238197 is an equidigital number, since it uses as much as digits as its factorization.

154238197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 40.

The square root of 154238197 is about 12419.2671683960. The cubic root of 154238197 is about 536.2870540918.

The spelling of 154238197 in words is "one hundred fifty-four million, two hundred thirty-eight thousand, one hundred ninety-seven".