31042661 has 4 divisors (see below), whose sum is σ = 33430572. Its totient is φ = 28654752.

The previous prime is 31042651. The next prime is 31042681. The reversal of 31042661 is 16624013.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16624013 = 7 ⋅2374859.

It can be written as a sum of positive squares in 2 ways, for example, as 3940225 + 27102436 = 1985^2 + 5206^2 .

It is a cyclic number.

It is not a de Polignac number, because 31042661 - 2⁶ = 31042597 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 (31042631) 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, 1193936 + ... + 1193961.

It is an arithmetic number, because the mean of its divisors is an integer number (8357643).

Almost surely, 2^31042661 is an apocalyptic number.

It is an amenable number.

31042661 is a deficient number, since it is larger than the sum of its proper divisors (2387911).

31042661 is a wasteful number, since it uses less digits than its factorization.

31042661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2387910.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 31042661 is about 5571.5941165882. The cubic root of 31042661 is about 314.2821007357.

Adding to 31042661 its reverse (16624013), we get a palindrome (47666674).

The spelling of 31042661 in words is "thirty-one million, forty-two thousand, six hundred sixty-one".