68531511 has 8 divisors (see below), whose sum is σ = 93845104. Its totient is φ = 44452800.

The previous prime is 68531497. The next prime is 68531521. The reversal of 68531511 is 11513586.

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

It is not a de Polignac number, because 68531511 - 2⁵ = 68531479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68531521) 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, 308590 + ... + 308811.

It is an arithmetic number, because the mean of its divisors is an integer number (11730638).

Almost surely, 2^68531511 is an apocalyptic number.

68531511 is a deficient number, since it is larger than the sum of its proper divisors (25313593).

68531511 is a wasteful number, since it uses less digits than its factorization.

68531511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617441.

The product of its digits is 3600, while the sum is 30.

The square root of 68531511 is about 8278.3761088755. The cubic root of 68531511 is about 409.2262046191.

The spelling of 68531511 in words is "sixty-eight million, five hundred thirty-one thousand, five hundred eleven".