1321406516 has 6 divisors (see below), whose sum is σ = 2312461410. Its totient is φ = 660703256.

The previous prime is 1321406501. The next prime is 1321406521. The reversal of 1321406516 is 6156041231.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 673194916 + 648211600 = 25946^2 + 25460^2 .

It is a super-2 number, since 2×1321406516² = 3492230361054516512, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165175811 + ... + 165175818.

It is an arithmetic number, because the mean of its divisors is an integer number (385410235).

Almost surely, 2^1321406516 is an apocalyptic number.

It is an amenable number.

1321406516 is a deficient number, since it is larger than the sum of its proper divisors (991054894).

1321406516 is a wasteful number, since it uses less digits than its factorization.

1321406516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330351633 (or 330351631 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1321406516 is about 36351.1556350001. The cubic root of 1321406516 is about 1097.3507917877.

Adding to 1321406516 its reverse (6156041231), we get a palindrome (7477447747).

The spelling of 1321406516 in words is "one billion, three hundred twenty-one million, four hundred six thousand, five hundred sixteen".