661424031 has 12 divisors (see below), whose sum is σ = 964320552. Its totient is φ = 436827696.

The previous prime is 661424017. The next prime is 661424051. The reversal of 661424031 is 130424166.

661424031 is a `hidden beast` number, since 6 + 614 + 2 + 40 + 3 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-661424031 is a prime.

It is a super-2 number, since 2×661424031² = 874963497568577922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 661423986 and 661424004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661424051) 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, 342456 + ... + 344381.

It is an arithmetic number, because the mean of its divisors is an integer number (80360046).

Almost surely, 2^661424031 is an apocalyptic number.

661424031 is a deficient number, since it is larger than the sum of its proper divisors (302896521).

661424031 is a wasteful number, since it uses less digits than its factorization.

661424031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686950 (or 686947 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 661424031 is about 25718.1653894674. The cubic root of 661424031 is about 871.2845036825.

Adding to 661424031 its reverse (130424166), we get a palindrome (791848197).

The spelling of 661424031 in words is "six hundred sixty-one million, four hundred twenty-four thousand, thirty-one".