678322531 has 2 divisors, whose sum is σ = 678322532. Its totient is φ = 678322530.

The previous prime is 678322529. The next prime is 678322543. The reversal of 678322531 is 135223876.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 678322531 - 2¹ = 678322529 is a prime.

It is a super-2 number, since 2×678322531² = 920242912124491922, which contains 22 as substring.

Together with 678322529, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (678322511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339161265 + 339161266.

It is an arithmetic number, because the mean of its divisors is an integer number (339161266).

Almost surely, 2^678322531 is an apocalyptic number.

678322531 is a deficient number, since it is larger than the sum of its proper divisors (1).

678322531 is an equidigital number, since it uses as much as digits as its factorization.

678322531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 37.

The square root of 678322531 is about 26044.6257604136. The cubic root of 678322531 is about 878.6422463310.

The spelling of 678322531 in words is "six hundred seventy-eight million, three hundred twenty-two thousand, five hundred thirty-one".