1240525997 has 2 divisors, whose sum is σ = 1240525998. Its totient is φ = 1240525996.

The previous prime is 1240525991. The next prime is 1240526029. The reversal of 1240525997 is 7995250421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 831111241 + 409414756 = 28829^2 + 20234^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240525997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240525991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620262998 + 620262999.

It is an arithmetic number, because the mean of its divisors is an integer number (620262999).

Almost surely, 2^1240525997 is an apocalyptic number.

It is an amenable number.

1240525997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240525997 is an equidigital number, since it uses as much as digits as its factorization.

1240525997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 226800, while the sum is 44.

The square root of 1240525997 is about 35221.1015869748. The cubic root of 1240525997 is about 1074.4889575997.

The spelling of 1240525997 in words is "one billion, two hundred forty million, five hundred twenty-five thousand, nine hundred ninety-seven".