158033691 has 12 divisors (see below), whose sum is σ = 235634880. Its totient is φ = 101957040.

The previous prime is 158033677. The next prime is 158033719. The reversal of 158033691 is 196330851.

It is a happy number.

It is not a de Polignac number, because 158033691 - 2⁷ = 158033563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (158033641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 282936 + ... + 283493.

It is an arithmetic number, because the mean of its divisors is an integer number (19636240).

Almost surely, 2^158033691 is an apocalyptic number.

158033691 is a deficient number, since it is larger than the sum of its proper divisors (77601189).

158033691 is a wasteful number, since it uses less digits than its factorization.

158033691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566466 (or 566463 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 158033691 is about 12571.1451745654. The cubic root of 158033691 is about 540.6504404970.

The spelling of 158033691 in words is "one hundred fifty-eight million, thirty-three thousand, six hundred ninety-one".