68147531 has 2 divisors, whose sum is σ = 68147532. Its totient is φ = 68147530.

The previous prime is 68147503. The next prime is 68147587. The reversal of 68147531 is 13574186.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68147531 - 2⁶ = 68147467 is a prime.

It is a super-2 number, since 2×68147531² = 9288171962791922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 68147491 and 68147500.

It is not a weakly prime, because it can be changed into another prime (68147501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34073765 + 34073766.

It is an arithmetic number, because the mean of its divisors is an integer number (34073766).

Almost surely, 2^68147531 is an apocalyptic number.

68147531 is a deficient number, since it is larger than the sum of its proper divisors (1).

68147531 is an equidigital number, since it uses as much as digits as its factorization.

68147531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 35.

The square root of 68147531 is about 8255.1517854004. The cubic root of 68147531 is about 408.4604786714.

The spelling of 68147531 in words is "sixty-eight million, one hundred forty-seven thousand, five hundred thirty-one".