825207491 has 2 divisors, whose sum is σ = 825207492. Its totient is φ = 825207490.

The previous prime is 825207463. The next prime is 825207521. The reversal of 825207491 is 194702528.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 825207491 - 2²² = 821013187 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (825207401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412603745 + 412603746.

It is an arithmetic number, because the mean of its divisors is an integer number (412603746).

Almost surely, 2^825207491 is an apocalyptic number.

825207491 is a deficient number, since it is larger than the sum of its proper divisors (1).

825207491 is an equidigital number, since it uses as much as digits as its factorization.

825207491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 825207491 is about 28726.4249603044. The cubic root of 825207491 is about 937.9673487573.

The spelling of 825207491 in words is "eight hundred twenty-five million, two hundred seven thousand, four hundred ninety-one".