31421867 has 4 divisors (see below), whose sum is σ = 32188296. Its totient is φ = 30655440.

The previous prime is 31421857. The next prime is 31421869. The reversal of 31421867 is 76812413.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31421867 - 2⁴ = 31421851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31421869) 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, 383153 + ... + 383234.

It is an arithmetic number, because the mean of its divisors is an integer number (8047074).

Almost surely, 2^31421867 is an apocalyptic number.

31421867 is a deficient number, since it is larger than the sum of its proper divisors (766429).

31421867 is an equidigital number, since it uses as much as digits as its factorization.

31421867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766428.

The product of its digits is 8064, while the sum is 32.

The square root of 31421867 is about 5605.5211176125. The cubic root of 31421867 is about 315.5566440474.

The spelling of 31421867 in words is "thirty-one million, four hundred twenty-one thousand, eight hundred sixty-seven".