31423687 has 2 divisors, whose sum is σ = 31423688. Its totient is φ = 31423686.

The previous prime is 31423673. The next prime is 31423697. The reversal of 31423687 is 78632413.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31423687 - 2¹⁹ = 30899399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31423627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15711843 + 15711844.

It is an arithmetic number, because the mean of its divisors is an integer number (15711844).

Almost surely, 2^31423687 is an apocalyptic number.

31423687 is a deficient number, since it is larger than the sum of its proper divisors (1).

31423687 is an equidigital number, since it uses as much as digits as its factorization.

31423687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 34.

The square root of 31423687 is about 5605.6834552087. The cubic root of 31423687 is about 315.5627364289.

The spelling of 31423687 in words is "thirty-one million, four hundred twenty-three thousand, six hundred eighty-seven".