1661430031 has 2 divisors, whose sum is σ = 1661430032. Its totient is φ = 1661430030.

The previous prime is 1661430011. The next prime is 1661430059. The reversal of 1661430031 is 1300341661.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1661430031 - 2⁵ = 1661429999 is a prime.

It is a super-2 number, since 2×1661430031² = 5520699495817321922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1661429978 and 1661430005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1661430011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830715015 + 830715016.

It is an arithmetic number, because the mean of its divisors is an integer number (830715016).

Almost surely, 2^1661430031 is an apocalyptic number.

1661430031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661430031 is an equidigital number, since it uses as much as digits as its factorization.

1661430031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1661430031 is about 40760.6431622466. The cubic root of 1661430031 is about 1184.3880550873.

Adding to 1661430031 its reverse (1300341661), we get a palindrome (2961771692).

The spelling of 1661430031 in words is "one billion, six hundred sixty-one million, four hundred thirty thousand, thirty-one".