840625031 has 2 divisors, whose sum is σ = 840625032. Its totient is φ = 840625030.

The previous prime is 840625021. The next prime is 840625043. The reversal of 840625031 is 130526048.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-840625031 is a prime.

It is a super-2 number, since 2×840625031² = 1413300885487501922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 840624985 and 840625003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840625021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420312515 + 420312516.

It is an arithmetic number, because the mean of its divisors is an integer number (420312516).

Almost surely, 2^840625031 is an apocalyptic number.

840625031 is a deficient number, since it is larger than the sum of its proper divisors (1).

840625031 is an equidigital number, since it uses as much as digits as its factorization.

840625031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 840625031 is about 28993.5342964600. The cubic root of 840625031 is about 943.7727622479.

The spelling of 840625031 in words is "eight hundred forty million, six hundred twenty-five thousand, thirty-one".