155197 has 4 divisors (see below), whose sum is σ = 177376. Its totient is φ = 133020.

The previous prime is 155191. The next prime is 155201. The reversal of 155197 is 791551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 791551 = 283 ⋅2797.

It is a cyclic number.

It is not a de Polignac number, because 155197 - 2⁷ = 155069 is a prime.

It is a super-2 number, since 2×155197² = 48172217618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11079 + ... + 11092.

It is an arithmetic number, because the mean of its divisors is an integer number (44344).

2¹⁵⁵¹⁹⁷ is an apocalyptic number.

It is an amenable number.

155197 is a deficient number, since it is larger than the sum of its proper divisors (22179).

155197 is an equidigital number, since it uses as much as digits as its factorization.

155197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22178.

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

The square root of 155197 is about 393.9505045053. The cubic root of 155197 is about 53.7396013776.

The spelling of 155197 in words is "one hundred fifty-five thousand, one hundred ninety-seven".