1320631694 has 4 divisors (see below), whose sum is σ = 1980947544. Its totient is φ = 660315846.

The previous prime is 1320631691. The next prime is 1320631699. The reversal of 1320631694 is 4961360231.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4961360231 = 11383 ⋅435857.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320631691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330157922 + ... + 330157925.

It is an arithmetic number, because the mean of its divisors is an integer number (495236886).

Almost surely, 2^1320631694 is an apocalyptic number.

1320631694 is a deficient number, since it is larger than the sum of its proper divisors (660315850).

1320631694 is an equidigital number, since it uses as much as digits as its factorization.

1320631694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660315849.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 1320631694 is about 36340.4966119067. The cubic root of 1320631694 is about 1097.1362684082.

The spelling of 1320631694 in words is "one billion, three hundred twenty million, six hundred thirty-one thousand, six hundred ninety-four".