44001691 has 12 divisors (see below), whose sum is σ = 46328128. Its totient is φ = 41787504.

The previous prime is 44001673. The next prime is 44001707. The reversal of 44001691 is 19610044.

44001691 = 64² + 65² + ... + 509².

It is not a de Polignac number, because 44001691 - 2⁹ = 44001179 is a prime.

It is a super-2 number, since 2×44001691² = 3872297621718962, which contains 22 as substring.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (44001631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117781 + ... + 118153.

Almost surely, 2^44001691 is an apocalyptic number.

44001691 is a deficient number, since it is larger than the sum of its proper divisors (2326437).

44001691 is a wasteful number, since it uses less digits than its factorization.

44001691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642 (or 619 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 44001691 is about 6633.3770434071. The cubic root of 44001691 is about 353.0393560648.

The spelling of 44001691 in words is "forty-four million, one thousand, six hundred ninety-one".