1525021213 has 2 divisors, whose sum is σ = 1525021214. Its totient is φ = 1525021212.

The previous prime is 1525021139. The next prime is 1525021217. The reversal of 1525021213 is 3121205251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1500942564 + 24078649 = 38742^2 + 4907^2 .

It is a cyclic number.

It is not a de Polignac number, because 1525021213 - 2¹⁷ = 1524890141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1525021217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 762510606 + 762510607.

It is an arithmetic number, because the mean of its divisors is an integer number (762510607).

Almost surely, 2^1525021213 is an apocalyptic number.

It is an amenable number.

1525021213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1525021213 is an equidigital number, since it uses as much as digits as its factorization.

1525021213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1525021213 is about 39051.5199832222. The cubic root of 1525021213 is about 1151.0440960028.

Adding to 1525021213 its reverse (3121205251), we get a palindrome (4646226464).

It can be divided in two parts, 15250 and 21213, that added together give a palindrome (36463).

The spelling of 1525021213 in words is "one billion, five hundred twenty-five million, twenty-one thousand, two hundred thirteen".