1525421761 has 2 divisors, whose sum is σ = 1525421762. Its totient is φ = 1525421760.

The previous prime is 1525421759. The next prime is 1525421767. The reversal of 1525421761 is 1671245251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1525371136 + 50625 = 39056^2 + 225^2 .

It is a cyclic number.

It is not a de Polignac number, because 1525421761 - 2¹ = 1525421759 is a prime.

It is a super-2 number, since 2×1525421761² = 4653823097864682242, which contains 22 as substring.

Together with 1525421759, it forms a pair of twin primes.

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, 762710880 + 762710881.

It is an arithmetic number, because the mean of its divisors is an integer number (762710881).

Almost surely, 2^1525421761 is an apocalyptic number.

It is an amenable number.

1525421761 is a deficient number, since it is larger than the sum of its proper divisors (1).

1525421761 is an equidigital number, since it uses as much as digits as its factorization.

1525421761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16800, while the sum is 34.

The square root of 1525421761 is about 39056.6481024678. The cubic root of 1525421761 is about 1151.1448613883.

The spelling of 1525421761 in words is "one billion, five hundred twenty-five million, four hundred twenty-one thousand, seven hundred sixty-one".