1023131521 has 2 divisors, whose sum is σ = 1023131522. Its totient is φ = 1023131520.

The previous prime is 1023131453. The next prime is 1023131581. The reversal of 1023131521 is 1251313201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 824321521 + 198810000 = 28711^2 + 14100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1023131521 is a prime.

It is not a weakly prime, because it can be changed into another prime (1023131581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511565760 + 511565761.

It is an arithmetic number, because the mean of its divisors is an integer number (511565761).

Almost surely, 2^1023131521 is an apocalyptic number.

It is an amenable number.

1023131521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1023131521 is an equidigital number, since it uses as much as digits as its factorization.

1023131521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 1023131521 is about 31986.4271371468. The cubic root of 1023131521 is about 1007.6518075037.

Adding to 1023131521 its reverse (1251313201), we get a palindrome (2274444722).

The spelling of 1023131521 in words is "one billion, twenty-three million, one hundred thirty-one thousand, five hundred twenty-one".