155196691 has 4 divisors (see below), whose sum is σ = 167134912. Its totient is φ = 143258472.

The previous prime is 155196683. The next prime is 155196737. The reversal of 155196691 is 196691551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 196691551 = 7 ⋅28098793.

It is a cyclic number.

It is not a de Polignac number, because 155196691 - 2³ = 155196683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155196641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5969091 + ... + 5969116.

It is an arithmetic number, because the mean of its divisors is an integer number (41783728).

Almost surely, 2^155196691 is an apocalyptic number.

155196691 is a deficient number, since it is larger than the sum of its proper divisors (11938221).

155196691 is a wasteful number, since it uses less digits than its factorization.

155196691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11938220.

The product of its digits is 72900, while the sum is 43.

The square root of 155196691 is about 12457.7963942264. The cubic root of 155196691 is about 537.3956571208.

The spelling of 155196691 in words is "one hundred fifty-five million, one hundred ninety-six thousand, six hundred ninety-one".