661430031 has 8 divisors (see below), whose sum is σ = 886339200. Its totient is φ = 438737112.

The previous prime is 661430027. The next prime is 661430047. The reversal of 661430031 is 130034166.

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

It is not a de Polignac number, because 661430031 - 2² = 661430027 is a prime.

It is a super-2 number, since 2×661430031² = 874979371817321922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 661429983 and 661430010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661430531) 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, 553365 + ... + 554558.

It is an arithmetic number, because the mean of its divisors is an integer number (110792400).

Almost surely, 2^661430031 is an apocalyptic number.

661430031 is a deficient number, since it is larger than the sum of its proper divisors (224909169).

661430031 is a wasteful number, since it uses less digits than its factorization.

661430031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108125.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 661430031 is about 25718.2820382700. The cubic root of 661430031 is about 871.2871382462.

Adding to 661430031 its reverse (130034166), we get a palindrome (791464197).

The spelling of 661430031 in words is "six hundred sixty-one million, four hundred thirty thousand, thirty-one".