31424561 has 8 divisors (see below), whose sum is σ = 35954880. Its totient is φ = 26904528.

The previous prime is 31424539. The next prime is 31424593. The reversal of 31424561 is 16542413.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-31424561 is a prime.

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 31424561.

It is not an unprimeable number, because it can be changed into a prime (31420561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5810 + ... + 9828.

It is an arithmetic number, because the mean of its divisors is an integer number (4494360).

Almost surely, 2^31424561 is an apocalyptic number.

It is an amenable number.

31424561 is a deficient number, since it is larger than the sum of its proper divisors (4530319).

31424561 is a wasteful number, since it uses less digits than its factorization.

31424561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5143.

The product of its digits is 2880, while the sum is 26.

The square root of 31424561 is about 5605.7614112625. The cubic root of 31424561 is about 315.5656620274.

Adding to 31424561 its reverse (16542413), we get a palindrome (47966974).

The spelling of 31424561 in words is "thirty-one million, four hundred twenty-four thousand, five hundred sixty-one".