43261631 has 4 divisors (see below), whose sum is σ = 49441872. Its totient is φ = 37081392.

The previous prime is 43261619. The next prime is 43261657. The reversal of 43261631 is 13616234.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 43261631 - 2⁶ = 43261567 is a prime.

It is a super-2 number, since 2×43261631² = 3743137433560322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43261631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43261681) 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, 3090110 + ... + 3090123.

It is an arithmetic number, because the mean of its divisors is an integer number (12360468).

Almost surely, 2^43261631 is an apocalyptic number.

43261631 is a deficient number, since it is larger than the sum of its proper divisors (6180241).

43261631 is an equidigital number, since it uses as much as digits as its factorization.

43261631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6180240.

The product of its digits is 2592, while the sum is 26.

The square root of 43261631 is about 6577.3574480942. The cubic root of 43261631 is about 351.0489105360.

Adding to 43261631 its reverse (13616234), we get a palindrome (56877865).

The spelling of 43261631 in words is "forty-three million, two hundred sixty-one thousand, six hundred thirty-one".