31267661 has 4 divisors (see below), whose sum is σ = 31405632. Its totient is φ = 31129692.

The previous prime is 31267651. The next prime is 31267667. The reversal of 31267661 is 16676213.

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.

It is a cyclic number.

It is not a de Polignac number, because 31267661 - 2¹⁸ = 31005517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31267667) 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, 68645 + ... + 69098.

It is an arithmetic number, because the mean of its divisors is an integer number (7851408).

Almost surely, 2^31267661 is an apocalyptic number.

It is an amenable number.

31267661 is a deficient number, since it is larger than the sum of its proper divisors (137971).

31267661 is a wasteful number, since it uses less digits than its factorization.

31267661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137970.

The product of its digits is 9072, while the sum is 32.

The square root of 31267661 is about 5591.7493684893. The cubic root of 31267661 is about 315.0395885408.

The spelling of 31267661 in words is "thirty-one million, two hundred sixty-seven thousand, six hundred sixty-one".