155133691 has 2 divisors, whose sum is σ = 155133692. Its totient is φ = 155133690.

The previous prime is 155133683. The next prime is 155133707. The reversal of 155133691 is 196331551.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155133691 - 2³ = 155133683 is a prime.

It is not a weakly prime, because it can be changed into another prime (155133631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77566845 + 77566846.

It is an arithmetic number, because the mean of its divisors is an integer number (77566846).

Almost surely, 2^155133691 is an apocalyptic number.

155133691 is a deficient number, since it is larger than the sum of its proper divisors (1).

155133691 is an equidigital number, since it uses as much as digits as its factorization.

155133691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12150, while the sum is 34.

The square root of 155133691 is about 12455.2676004974. The cubic root of 155133691 is about 537.3229311102.

The spelling of 155133691 in words is "one hundred fifty-five million, one hundred thirty-three thousand, six hundred ninety-one".