1213401525 has 48 divisors (see below), whose sum is σ = 2318601600. Its totient is φ = 548444160.

The previous prime is 1213401521. The next prime is 1213401533. The reversal of 1213401525 is 5251043121.

It is a happy number.

It is not a de Polignac number, because 1213401525 - 2² = 1213401521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213401495 and 1213401504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213401521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33741 + ... + 59709.

It is an arithmetic number, because the mean of its divisors is an integer number (48304200).

Almost surely, 2^1213401525 is an apocalyptic number.

1213401525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1213401525 is a deficient number, since it is larger than the sum of its proper divisors (1105200075).

1213401525 is a wasteful number, since it uses less digits than its factorization.

1213401525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26078 (or 26073 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1213401525 is about 34833.9134321712. The cubic root of 1213401525 is about 1066.5998349512.

Adding to 1213401525 its reverse (5251043121), we get a palindrome (6464444646).

The spelling of 1213401525 in words is "one billion, two hundred thirteen million, four hundred one thousand, five hundred twenty-five".