155838197 has 2 divisors, whose sum is σ = 155838198. Its totient is φ = 155838196.

The previous prime is 155838173. The next prime is 155838211. The reversal of 155838197 is 791838551.

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., 142229476 + 13608721 = 11926^2 + 3689^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155838197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155838107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77919098 + 77919099.

It is an arithmetic number, because the mean of its divisors is an integer number (77919099).

Almost surely, 2^155838197 is an apocalyptic number.

It is an amenable number.

155838197 is a deficient number, since it is larger than the sum of its proper divisors (1).

155838197 is an equidigital number, since it uses as much as digits as its factorization.

155838197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 302400, while the sum is 47.

The square root of 155838197 is about 12483.5170124449. The cubic root of 155838197 is about 538.1350814514.

The spelling of 155838197 in words is "one hundred fifty-five million, eight hundred thirty-eight thousand, one hundred ninety-seven".