661417031 has 8 divisors (see below), whose sum is σ = 721743744. Its totient is φ = 601123320.

The previous prime is 661417021. The next prime is 661417033. The reversal of 661417031 is 130714166.

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

It is a cyclic number.

It is not a de Polignac number, because 661417031 - 2¹⁴ = 661400647 is a prime.

It is a super-2 number, since 2×661417031² = 874944977793709922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 661416985 and 661417003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661417033) 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, 54350 + ... + 65396.

It is an arithmetic number, because the mean of its divisors is an integer number (90217968).

Almost surely, 2^661417031 is an apocalyptic number.

661417031 is a deficient number, since it is larger than the sum of its proper divisors (60326713).

661417031 is a wasteful number, since it uses less digits than its factorization.

661417031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16501.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 661417031 is about 25718.0292985291. The cubic root of 661417031 is about 871.2814300047.

The spelling of 661417031 in words is "six hundred sixty-one million, four hundred seventeen thousand, thirty-one".