531868478 has 4 divisors (see below), whose sum is σ = 797802720. Its totient is φ = 265934238.

The previous prime is 531868471. The next prime is 531868481. The reversal of 531868478 is 874868135.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531868471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132967118 + ... + 132967121.

It is an arithmetic number, because the mean of its divisors is an integer number (199450680).

Almost surely, 2^531868478 is an apocalyptic number.

531868478 is a deficient number, since it is larger than the sum of its proper divisors (265934242).

531868478 is a wasteful number, since it uses less digits than its factorization.

531868478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265934241.

The product of its digits is 1290240, while the sum is 50.

The square root of 531868478 is about 23062.2739121709. The cubic root of 531868478 is about 810.2171231182.

The spelling of 531868478 in words is "five hundred thirty-one million, eight hundred sixty-eight thousand, four hundred seventy-eight".