1213520646 has 32 divisors (see below), whose sum is σ = 2617802208. Its totient is φ = 372810240.

The previous prime is 1213520629. The next prime is 1213520647. The reversal of 1213520646 is 6460253121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213520647) 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 15 ways as a sum of consecutive naturals, for example, 39790 + ... + 63326.

It is an arithmetic number, because the mean of its divisors is an integer number (81806319).

Almost surely, 2^1213520646 is an apocalyptic number.

1213520646 is an abundant number, since it is smaller than the sum of its proper divisors (1404281562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1213520646 is a wasteful number, since it uses less digits than its factorization.

1213520646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24216.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1213520646 is about 34835.6232325475. The cubic root of 1213520646 is about 1066.6347369131.

Adding to 1213520646 its reverse (6460253121), we get a palindrome (7673773767).

The spelling of 1213520646 in words is "one billion, two hundred thirteen million, five hundred twenty thousand, six hundred forty-six".