1525221203 has 4 divisors (see below), whose sum is σ = 1663877688. Its totient is φ = 1386564720.

The previous prime is 1525221167. The next prime is 1525221221. The reversal of 1525221203 is 3021225251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3021225251 = 11 ⋅274656841.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1525221203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1525221703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69328226 + ... + 69328247.

It is an arithmetic number, because the mean of its divisors is an integer number (415969422).

Almost surely, 2^1525221203 is an apocalyptic number.

1525221203 is a deficient number, since it is larger than the sum of its proper divisors (138656485).

1525221203 is a wasteful number, since it uses less digits than its factorization.

1525221203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138656484.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1525221203 is about 39054.0804910319. The cubic root of 1525221203 is about 1151.0944094552.

Adding to 1525221203 its reverse (3021225251), we get a palindrome (4546446454).

The spelling of 1525221203 in words is "one billion, five hundred twenty-five million, two hundred twenty-one thousand, two hundred three".