43425531 has 32 divisors (see below), whose sum is σ = 69986880. Its totient is φ = 26500608.

The previous prime is 43425527. The next prime is 43425539. The reversal of 43425531 is 13552434.

It is not a de Polignac number, because 43425531 - 2² = 43425527 is a prime.

It is a super-2 number, since 2×43425531² = 3771553485263922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 43425495 and 43425504.

It is not an unprimeable number, because it can be changed into a prime (43425539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15705 + ... + 18261.

It is an arithmetic number, because the mean of its divisors is an integer number (2187090).

Almost surely, 2^43425531 is an apocalyptic number.

43425531 is a deficient number, since it is larger than the sum of its proper divisors (26561349).

43425531 is a wasteful number, since it uses less digits than its factorization.

43425531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2620 (or 2614 counting only the distinct ones).

The product of its digits is 7200, while the sum is 27.

The square root of 43425531 is about 6589.8050805771. The cubic root of 43425531 is about 351.4916770758.

Adding to 43425531 its reverse (13552434), we get a palindrome (56977965).

It can be divided in two parts, 43425 and 531, that added together give a triangular number (43956 = T₂₉₆).

The spelling of 43425531 in words is "forty-three million, four hundred twenty-five thousand, five hundred thirty-one".