1401435641 has 4 divisors (see below), whose sum is σ = 1401512052. Its totient is φ = 1401359232.

The previous prime is 1401435587. The next prime is 1401435671. The reversal of 1401435641 is 1465341041.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1465341041 = 337 ⋅4348193.

It can be written as a sum of positive squares in 2 ways, for example, as 691479616 + 709956025 = 26296^2 + 26645^2 .

It is a cyclic number.

It is not a de Polignac number, because 1401435641 - 2⁶ = 1401435577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1401435671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7661 + ... + 53493.

It is an arithmetic number, because the mean of its divisors is an integer number (350378013).

Almost surely, 2^1401435641 is an apocalyptic number.

It is an amenable number.

1401435641 is a deficient number, since it is larger than the sum of its proper divisors (76411).

1401435641 is an equidigital number, since it uses as much as digits as its factorization.

1401435641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76410.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 1401435641 is about 37435.7535118501. The cubic root of 1401435641 is about 1119.0712009028.

Adding to 1401435641 its reverse (1465341041), we get a palindrome (2866776682).

The spelling of 1401435641 in words is "one billion, four hundred one million, four hundred thirty-five thousand, six hundred forty-one".