1525311121 has 2 divisors, whose sum is σ = 1525311122. Its totient is φ = 1525311120.

The previous prime is 1525311113. The next prime is 1525311133. The reversal of 1525311121 is 1211135251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1107558400 + 417752721 = 33280^2 + 20439^2 .

It is a cyclic number.

It is not a de Polignac number, because 1525311121 - 2³ = 1525311113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1525311092 and 1525311101.

It is not a weakly prime, because it can be changed into another prime (1525311721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 762655560 + 762655561.

It is an arithmetic number, because the mean of its divisors is an integer number (762655561).

Almost surely, 2^1525311121 is an apocalyptic number.

It is an amenable number.

1525311121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1525311121 is an equidigital number, since it uses as much as digits as its factorization.

1525311121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 300, while the sum is 22.

The square root of 1525311121 is about 39055.2316725941. The cubic root of 1525311121 is about 1151.1170295781.

Adding to 1525311121 its reverse (1211135251), we get a palindrome (2736446372).

The spelling of 1525311121 in words is "one billion, five hundred twenty-five million, three hundred eleven thousand, one hundred twenty-one".