2001251444 has 24 divisors (see below), whose sum is σ = 3578517600. Its totient is φ = 978979680.

The previous prime is 2001251411. The next prime is 2001251477. The reversal of 2001251444 is 4441521002.

It is an interprime number because it is at equal distance from previous prime (2001251411) and next prime (2001251477).

It is a super-2 number, since 2×2001251444² = 8010014684224170272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29702 + ... + 69890.

It is an arithmetic number, because the mean of its divisors is an integer number (149104900).

Almost surely, 2^2001251444 is an apocalyptic number.

It is an amenable number.

2001251444 is a deficient number, since it is larger than the sum of its proper divisors (1577266156).

2001251444 is a wasteful number, since it uses less digits than its factorization.

2001251444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40463 (or 40461 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 2001251444 is about 44735.3489312423. The cubic root of 2001251444 is about 1260.1837818765.

Adding to 2001251444 its reverse (4441521002), we get a palindrome (6442772446).

The spelling of 2001251444 in words is "two billion, one million, two hundred fifty-one thousand, four hundred forty-four".