387313231 has 2 divisors, whose sum is σ = 387313232. Its totient is φ = 387313230.

The previous prime is 387313211. The next prime is 387313243. The reversal of 387313231 is 132313783.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-387313231 is a prime.

It is a super-2 number, since 2×387313231² = 300023077815318722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 387313193 and 387313202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (387313211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193656615 + 193656616.

It is an arithmetic number, because the mean of its divisors is an integer number (193656616).

Almost surely, 2^387313231 is an apocalyptic number.

387313231 is a deficient number, since it is larger than the sum of its proper divisors (1).

387313231 is an equidigital number, since it uses as much as digits as its factorization.

387313231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 31.

The square root of 387313231 is about 19680.2751759217. The cubic root of 387313231 is about 728.9327188407.

The spelling of 387313231 in words is "three hundred eighty-seven million, three hundred thirteen thousand, two hundred thirty-one".