31672987 has 2 divisors, whose sum is σ = 31672988. Its totient is φ = 31672986.

The previous prime is 31672967. The next prime is 31673003. The reversal of 31672987 is 78927613.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (78927613) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31672987 - 2⁷ = 31672859 is a prime.

It is not a weakly prime, because it can be changed into another prime (31672967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15836493 + 15836494.

It is an arithmetic number, because the mean of its divisors is an integer number (15836494).

Almost surely, 2^31672987 is an apocalyptic number.

31672987 is a deficient number, since it is larger than the sum of its proper divisors (1).

31672987 is an equidigital number, since it uses as much as digits as its factorization.

31672987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 43.

The square root of 31672987 is about 5627.8758870466. The cubic root of 31672987 is about 316.3950455074.

The spelling of 31672987 in words is "thirty-one million, six hundred seventy-two thousand, nine hundred eighty-seven".