1631331061 has 4 divisors (see below), whose sum is σ = 1658980800. Its totient is φ = 1603681324.

The previous prime is 1631331059. The next prime is 1631331151. The reversal of 1631331061 is 1601331361.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1601331361 = 7 ⋅228761623.

It is a cyclic number.

It is not a de Polignac number, because 1631331061 - 2¹ = 1631331059 is a prime.

It is a super-2 number, since 2×1631331061² = 5322482061166771442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631331041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13824781 + ... + 13824898.

It is an arithmetic number, because the mean of its divisors is an integer number (414745200).

Almost surely, 2^1631331061 is an apocalyptic number.

It is an amenable number.

1631331061 is a deficient number, since it is larger than the sum of its proper divisors (27649739).

1631331061 is an equidigital number, since it uses as much as digits as its factorization.

1631331061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27649738.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 1631331061 is about 40389.7395510295. The cubic root of 1631331061 is about 1177.1921800001.

It can be divided in two parts, 16313 and 31061, that added together give a palindrome (47374).

The spelling of 1631331061 in words is "one billion, six hundred thirty-one million, three hundred thirty-one thousand, sixty-one".