331661003 has 4 divisors (see below), whose sum is σ = 332741640. Its totient is φ = 330580368.

The previous prime is 331660997. The next prime is 331661009. The reversal of 331661003 is 300166133.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (331660997) and next prime (331661009).

It is a cyclic number.

It is not a de Polignac number, because 331661003 - 2²⁴ = 314883787 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 331661003.

It is not an unprimeable number, because it can be changed into a prime (331661009) 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 3 ways as a sum of consecutive naturals, for example, 539858 + ... + 540471.

It is an arithmetic number, because the mean of its divisors is an integer number (83185410).

Almost surely, 2^331661003 is an apocalyptic number.

331661003 is a deficient number, since it is larger than the sum of its proper divisors (1080637).

331661003 is a wasteful number, since it uses less digits than its factorization.

331661003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080636.

The product of its (nonzero) digits is 972, while the sum is 23.

The square root of 331661003 is about 18211.5623437420. The cubic root of 331661003 is about 692.1998007210.

The spelling of 331661003 in words is "three hundred thirty-one million, six hundred sixty-one thousand, three".