1401320645 has 4 divisors (see below), whose sum is σ = 1681584780. Its totient is φ = 1121056512.

The previous prime is 1401320633. The next prime is 1401320707. The reversal of 1401320645 is 5460231041.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 204575809 + 1196744836 = 14303^2 + 34594^2 .

It is a cyclic number.

It is not a de Polignac number, because 1401320645 - 2⁶ = 1401320581 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140132060 + ... + 140132069.

It is an arithmetic number, because the mean of its divisors is an integer number (420396195).

Almost surely, 2^1401320645 is an apocalyptic number.

It is an amenable number.

1401320645 is a deficient number, since it is larger than the sum of its proper divisors (280264135).

1401320645 is an equidigital number, since it uses as much as digits as its factorization.

1401320645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280264134.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 1401320645 is about 37434.2175689569. The cubic root of 1401320645 is about 1119.0405912841.

Adding to 1401320645 its reverse (5460231041), we get a palindrome (6861551686).

The spelling of 1401320645 in words is "one billion, four hundred one million, three hundred twenty thousand, six hundred forty-five".