1001001401 has 4 divisors (see below), whose sum is σ = 1001428452. Its totient is φ = 1000574352.

The previous prime is 1001001359. The next prime is 1001001409. The reversal of 1001001401 is 1041001001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1041001001 = 17 ⋅61235353.

It can be written as a sum of positive squares in 2 ways, for example, as 600201001 + 400800400 = 24499^2 + 20020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001001401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1001001409) 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, 209990 + ... + 214703.

It is an arithmetic number, because the mean of its divisors is an integer number (250357113).

Almost surely, 2^1001001401 is an apocalyptic number.

It is an amenable number.

1001001401 is a deficient number, since it is larger than the sum of its proper divisors (427051).

1001001401 is an equidigital number, since it uses as much as digits as its factorization.

1001001401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427050.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1001001401 is about 31638.6061797924. The cubic root of 1001001401 is about 1000.3336889726. Note that the first 3 decimals are identical.

Adding to 1001001401 its reverse (1041001001), we get a palindrome (2042002402).

The spelling of 1001001401 in words is "one billion, one million, one thousand, four hundred one".