31618061 has 2 divisors, whose sum is σ = 31618062. Its totient is φ = 31618060.

The previous prime is 31618057. The next prime is 31618063. The reversal of 31618061 is 16081613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27102436 + 4515625 = 5206^2 + 2125^2 .

It is a cyclic number.

It is not a de Polignac number, because 31618061 - 2² = 31618057 is a prime.

Together with 31618063, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31618061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31618063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15809030 + 15809031.

It is an arithmetic number, because the mean of its divisors is an integer number (15809031).

Almost surely, 2^31618061 is an apocalyptic number.

It is an amenable number.

31618061 is a deficient number, since it is larger than the sum of its proper divisors (1).

31618061 is an equidigital number, since it uses as much as digits as its factorization.

31618061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 31618061 is about 5622.9939534024. The cubic root of 31618061 is about 316.2120465632.

Adding to 31618061 its reverse (16081613), we get a palindrome (47699674).

The spelling of 31618061 in words is "thirty-one million, six hundred eighteen thousand, sixty-one".