31060861 has 4 divisors (see below), whose sum is σ = 33450172. Its totient is φ = 28671552.

The previous prime is 31060859. The next prime is 31060891. The reversal of 31060861 is 16806013.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11088900 + 19971961 = 3330^2 + 4469^2 .

It is not a de Polignac number, because 31060861 - 2¹ = 31060859 is a prime.

It is a super-2 number, since 2×31060861² = 1929554172122642, 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 (31060811) 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, 1194636 + ... + 1194661.

It is an arithmetic number, because the mean of its divisors is an integer number (8362543).

Almost surely, 2^31060861 is an apocalyptic number.

It is an amenable number.

31060861 is a deficient number, since it is larger than the sum of its proper divisors (2389311).

31060861 is a wasteful number, since it uses less digits than its factorization.

31060861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2389310.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 31060861 is about 5573.2271620669. The cubic root of 31060861 is about 314.3435088814.

Adding to 31060861 its reverse (16806013), we get a palindrome (47866874).

The spelling of 31060861 in words is "thirty-one million, sixty thousand, eight hundred sixty-one".