1321609263 has 16 divisors (see below), whose sum is σ = 1929863040. Its totient is φ = 799511904.

The previous prime is 1321609231. The next prime is 1321609307. The reversal of 1321609263 is 3629061231.

It is not a de Polignac number, because 1321609263 - 2⁵ = 1321609231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321609063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 284881 + ... + 289482.

It is an arithmetic number, because the mean of its divisors is an integer number (120616440).

Almost surely, 2^1321609263 is an apocalyptic number.

1321609263 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1321609263 is a deficient number, since it is larger than the sum of its proper divisors (608253777).

1321609263 is a wasteful number, since it uses less digits than its factorization.

1321609263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574438.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 1321609263 is about 36353.9442564352. The cubic root of 1321609263 is about 1097.4069120909.

The spelling of 1321609263 in words is "one billion, three hundred twenty-one million, six hundred nine thousand, two hundred sixty-three".