525387391 has 2 divisors, whose sum is σ = 525387392. Its totient is φ = 525387390.

The previous prime is 525387337. The next prime is 525387491. The reversal of 525387391 is 193783525.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 525387391 - 2¹³ = 525379199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (525387301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262693695 + 262693696.

It is an arithmetic number, because the mean of its divisors is an integer number (262693696).

Almost surely, 2^525387391 is an apocalyptic number.

525387391 is a deficient number, since it is larger than the sum of its proper divisors (1).

525387391 is an equidigital number, since it uses as much as digits as its factorization.

525387391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 43.

The square root of 525387391 is about 22921.3304805807. The cubic root of 525387391 is about 806.9126957317.

The spelling of 525387391 in words is "five hundred twenty-five million, three hundred eighty-seven thousand, three hundred ninety-one".