1245231521 has 8 divisors (see below), whose sum is σ = 1340828640. Its totient is φ = 1152117568.

The previous prime is 1245231517. The next prime is 1245231607. The reversal of 1245231521 is 1251325421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1245231521 - 2² = 1245231517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1245231511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 619751 + ... + 621756.

It is an arithmetic number, because the mean of its divisors is an integer number (167603580).

Almost surely, 2^1245231521 is an apocalyptic number.

It is an amenable number.

1245231521 is a deficient number, since it is larger than the sum of its proper divisors (95597119).

1245231521 is a wasteful number, since it uses less digits than its factorization.

1245231521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241583.

The product of its digits is 2400, while the sum is 26.

The square root of 1245231521 is about 35287.8381457408. The cubic root of 1245231521 is about 1075.8458159625.

Adding to 1245231521 its reverse (1251325421), we get a palindrome (2496556942).

The spelling of 1245231521 in words is "one billion, two hundred forty-five million, two hundred thirty-one thousand, five hundred twenty-one".