43381001 has 4 divisors (see below), whose sum is σ = 43396992. Its totient is φ = 43365012.

The previous prime is 43380979. The next prime is 43381069. The reversal of 43381001 is 10018334.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10018334 = 2 ⋅5009167.

It is a cyclic number.

It is not a de Polignac number, because 43381001 - 2¹⁰ = 43379977 is a prime.

It is a super-2 number, since 2×43381001² = 3763822495524002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43381081) 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, 2801 + ... + 9726.

It is an arithmetic number, because the mean of its divisors is an integer number (10849248).

Almost surely, 2^43381001 is an apocalyptic number.

It is an amenable number.

43381001 is a deficient number, since it is larger than the sum of its proper divisors (15991).

43381001 is a wasteful number, since it uses less digits than its factorization.

43381001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15990.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 43381001 is about 6586.4255100927. The cubic root of 43381001 is about 351.3714921901.

Adding to 43381001 its reverse (10018334), we get a palindrome (53399335).

The spelling of 43381001 in words is "forty-three million, three hundred eighty-one thousand, one".