731216987 has 2 divisors, whose sum is σ = 731216988. Its totient is φ = 731216986.

The previous prime is 731216947. The next prime is 731216999. The reversal of 731216987 is 789612137.

It is a strong prime.

It is an emirp because it is prime and its reverse (789612137) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 731216987 - 2¹⁸ = 730954843 is a prime.

It is not a weakly prime, because it can be changed into another prime (731216947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365608493 + 365608494.

It is an arithmetic number, because the mean of its divisors is an integer number (365608494).

Almost surely, 2^731216987 is an apocalyptic number.

731216987 is a deficient number, since it is larger than the sum of its proper divisors (1).

731216987 is an equidigital number, since it uses as much as digits as its factorization.

731216987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 44.

The square root of 731216987 is about 27041.0241485044. The cubic root of 731216987 is about 900.9114170387.

It can be divided in two parts, 73121 and 6987, that added together give a palindrome (80108).

The spelling of 731216987 in words is "seven hundred thirty-one million, two hundred sixteen thousand, nine hundred eighty-seven".