1661030331 has 8 divisors (see below), whose sum is σ = 2331270720. Its totient is φ = 1049071752.

The previous prime is 1661030317. The next prime is 1661030341. The reversal of 1661030331 is 1330301661.

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

It is not a de Polignac number, because 1661030331 - 2²¹ = 1658933179 is a prime.

It is a super-2 number, since 2×1661030331² = 5518043521003939122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1661030341) 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, 14570385 + ... + 14570498.

It is an arithmetic number, because the mean of its divisors is an integer number (291408840).

Almost surely, 2^1661030331 is an apocalyptic number.

1661030331 is a deficient number, since it is larger than the sum of its proper divisors (670240389).

1661030331 is a wasteful number, since it uses less digits than its factorization.

1661030331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29140905.

The product of its (nonzero) digits is 972, while the sum is 24.

The square root of 1661030331 is about 40755.7398534243. The cubic root of 1661030331 is about 1184.2930690683.

Adding to 1661030331 its reverse (1330301661), we get a palindrome (2991331992).

The spelling of 1661030331 in words is "one billion, six hundred sixty-one million, thirty thousand, three hundred thirty-one".