1525240781 has 2 divisors, whose sum is σ = 1525240782. Its totient is φ = 1525240780.

The previous prime is 1525240747. The next prime is 1525240811. The reversal of 1525240781 is 1870425251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 776123881 + 749116900 = 27859^2 + 27370^2 .

It is a cyclic number.

It is not a de Polignac number, because 1525240781 - 2¹⁰ = 1525239757 is a prime.

It is a super-2 number, since 2×1525240781² = 4652718880050979922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1525240741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 762620390 + 762620391.

It is an arithmetic number, because the mean of its divisors is an integer number (762620391).

Almost surely, 2^1525240781 is an apocalyptic number.

It is an amenable number.

1525240781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1525240781 is an equidigital number, since it uses as much as digits as its factorization.

1525240781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22400, while the sum is 35.

The square root of 1525240781 is about 39054.3311426531. The cubic root of 1525240781 is about 1151.0993346490.

The spelling of 1525240781 in words is "one billion, five hundred twenty-five million, two hundred forty thousand, seven hundred eighty-one".