1401002001 has 20 divisors (see below), whose sum is σ = 2391835072. Its totient is φ = 800572248.

The previous prime is 1401001997. The next prime is 1401002017. The reversal of 1401002001 is 1002001041.

It is a happy number.

It is not a de Polignac number, because 1401002001 - 2² = 1401001997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1401002041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1234885 + ... + 1236018.

Almost surely, 2^1401002001 is an apocalyptic number.

It is an amenable number.

1401002001 is a deficient number, since it is larger than the sum of its proper divisors (990833071).

1401002001 is an equidigital number, since it uses as much as digits as its factorization.

1401002001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2470922 (or 2470913 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1401002001 is about 37429.9612743588. The cubic root of 1401002001 is about 1118.9557659203.

Adding to 1401002001 its reverse (1002001041), we get a palindrome (2403003042).

The spelling of 1401002001 in words is "one billion, four hundred one million, two thousand, one".