158691403 has 4 divisors (see below), whose sum is σ = 170898448. Its totient is φ = 146484360.

The previous prime is 158691397. The next prime is 158691427. The reversal of 158691403 is 304196851.

158691403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 158691403 - 2¹³ = 158683211 is a prime.

It is a super-2 number, since 2×158691403² = 50365922772216818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158691433) 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, 6103503 + ... + 6103528.

It is an arithmetic number, because the mean of its divisors is an integer number (42724612).

Almost surely, 2^158691403 is an apocalyptic number.

158691403 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

158691403 is a deficient number, since it is larger than the sum of its proper divisors (12207045).

158691403 is a wasteful number, since it uses less digits than its factorization.

158691403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12207044.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 158691403 is about 12597.2776027204. The cubic root of 158691403 is about 541.3994371421.

The spelling of 158691403 in words is "one hundred fifty-eight million, six hundred ninety-one thousand, four hundred three".