31026661 has 2 divisors, whose sum is σ = 31026662. Its totient is φ = 31026660.

The previous prime is 31026647. The next prime is 31026673. The reversal of 31026661 is 16662013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28153636 + 2873025 = 5306^2 + 1695^2 .

It is a cyclic number.

It is not a de Polignac number, because 31026661 - 2¹⁷ = 30895589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31026631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15513330 + 15513331.

It is an arithmetic number, because the mean of its divisors is an integer number (15513331).

Almost surely, 2^31026661 is an apocalyptic number.

It is an amenable number.

31026661 is a deficient number, since it is larger than the sum of its proper divisors (1).

31026661 is an equidigital number, since it uses as much as digits as its factorization.

31026661 is an evil number, because the sum of its binary digits is even.

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

The square root of 31026661 is about 5570.1580767515. The cubic root of 31026661 is about 314.2280957242.

Adding to 31026661 its reverse (16662013), we get a palindrome (47688674).

The spelling of 31026661 in words is "thirty-one million, twenty-six thousand, six hundred sixty-one".