1525421717 has 2 divisors, whose sum is σ = 1525421718. Its totient is φ = 1525421716.

The previous prime is 1525421699. The next prime is 1525421753. The reversal of 1525421717 is 7171245251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1217032996 + 308388721 = 34886^2 + 17561^2 .

It is a cyclic number.

It is not a de Polignac number, because 1525421717 - 2²⁸ = 1256986261 is a prime.

It is a super-2 number, since 2×1525421717² = 4653822829390456178, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1525421767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 762710858 + 762710859.

It is an arithmetic number, because the mean of its divisors is an integer number (762710859).

Almost surely, 2^1525421717 is an apocalyptic number.

It is an amenable number.

1525421717 is a deficient number, since it is larger than the sum of its proper divisors (1).

1525421717 is an equidigital number, since it uses as much as digits as its factorization.

1525421717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19600, while the sum is 35.

The square root of 1525421717 is about 39056.6475391834. The cubic root of 1525421717 is about 1151.1448503203.

Adding to 1525421717 its reverse (7171245251), we get a palindrome (8696666968).

The spelling of 1525421717 in words is "one billion, five hundred twenty-five million, four hundred twenty-one thousand, seven hundred seventeen".