31042687 has 8 divisors (see below), whose sum is σ = 34509440. Its totient is φ = 27730080.

The previous prime is 31042681. The next prime is 31042721. The reversal of 31042687 is 78624013.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31042687 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31042681) 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 7 ways as a sum of consecutive naturals, for example, 38112 + ... + 38917.

It is an arithmetic number, because the mean of its divisors is an integer number (4313680).

Almost surely, 2^31042687 is an apocalyptic number.

31042687 is a deficient number, since it is larger than the sum of its proper divisors (3466753).

31042687 is a wasteful number, since it uses less digits than its factorization.

31042687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77073.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 31042687 is about 5571.5964498517. The cubic root of 31042687 is about 314.2821884787.

The spelling of 31042687 in words is "thirty-one million, forty-two thousand, six hundred eighty-seven".