31049661 has 4 divisors (see below), whose sum is σ = 41399552. Its totient is φ = 20699772.

The previous prime is 31049653. The next prime is 31049699. The reversal of 31049661 is 16694013.

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 not a de Polignac number, because 31049661 - 2³ = 31049653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31049611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5174941 + ... + 5174946.

It is an arithmetic number, because the mean of its divisors is an integer number (10349888).

Almost surely, 2^31049661 is an apocalyptic number.

It is an amenable number.

31049661 is a deficient number, since it is larger than the sum of its proper divisors (10349891).

31049661 is a wasteful number, since it uses less digits than its factorization.

31049661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10349890.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 31049661 is about 5572.2222676415. Note that the first 4 decimals coincide. The cubic root of 31049661 is about 314.3057220930.

The spelling of 31049661 in words is "thirty-one million, forty-nine thousand, six hundred sixty-one".