68158531 has 8 divisors (see below), whose sum is σ = 78412544. Its totient is φ = 58033800.

The previous prime is 68158501. The next prime is 68158543. The reversal of 68158531 is 13585186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68158531 - 2⁹ = 68158019 is a prime.

It is a super-2 number, since 2×68158531² = 9291170696155922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68158501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31185 + ... + 33298.

It is an arithmetic number, because the mean of its divisors is an integer number (9801568).

Almost surely, 2^68158531 is an apocalyptic number.

68158531 is a deficient number, since it is larger than the sum of its proper divisors (10254013).

68158531 is a wasteful number, since it uses less digits than its factorization.

68158531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64641.

The product of its digits is 28800, while the sum is 37.

The square root of 68158531 is about 8255.8180091376. The cubic root of 68158531 is about 408.4824546377.

The spelling of 68158531 in words is "sixty-eight million, one hundred fifty-eight thousand, five hundred thirty-one".