158691433 has 2 divisors, whose sum is σ = 158691434. Its totient is φ = 158691432.

The previous prime is 158691427. The next prime is 158691473. The reversal of 158691433 is 334196851.

158691433 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (158691473) can be obtained adding 158691433 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144312169 + 14379264 = 12013^2 + 3792^2 .

It is a cyclic number.

It is not a de Polignac number, because 158691433 - 2⁹ = 158690921 is a prime.

It is equal to p_8905099 and since 158691433 and 8905099 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (158691473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79345716 + 79345717.

It is an arithmetic number, because the mean of its divisors is an integer number (79345717).

Almost surely, 2^158691433 is an apocalyptic number.

It is an amenable number.

158691433 is a deficient number, since it is larger than the sum of its proper divisors (1).

158691433 is an equidigital number, since it uses as much as digits as its factorization.

158691433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 40.

The square root of 158691433 is about 12597.2787934538. The cubic root of 158691433 is about 541.3994712586.

The spelling of 158691433 in words is "one hundred fifty-eight million, six hundred ninety-one thousand, four hundred thirty-three".