1321641507 has 32 divisors (see below), whose sum is σ = 1873428480. Its totient is φ = 827436960.

The previous prime is 1321641491. The next prime is 1321641509. The reversal of 1321641507 is 7051461231.

It is not a de Polignac number, because 1321641507 - 2⁴ = 1321641491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321641509) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 666844 + ... + 668822.

It is an arithmetic number, because the mean of its divisors is an integer number (58544640).

Almost surely, 2^1321641507 is an apocalyptic number.

1321641507 is a deficient number, since it is larger than the sum of its proper divisors (551786973).

1321641507 is a wasteful number, since it uses less digits than its factorization.

1321641507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2223.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 1321641507 is about 36354.3877269306. The cubic root of 1321641507 is about 1097.4158366906.

The spelling of 1321641507 in words is "one billion, three hundred twenty-one million, six hundred forty-one thousand, five hundred seven".