31428671 has 4 divisors (see below), whose sum is σ = 31563792. Its totient is φ = 31293552.

The previous prime is 31428611. The next prime is 31428689. The reversal of 31428671 is 17682413.

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 31428671 - 2¹⁰ = 31427647 is a prime.

It is a super-2 number, since 2×31428671² = 1975522721652482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31428601) 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, 67211 + ... + 67676.

It is an arithmetic number, because the mean of its divisors is an integer number (7890948).

Almost surely, 2^31428671 is an apocalyptic number.

31428671 is a deficient number, since it is larger than the sum of its proper divisors (135121).

31428671 is a wasteful number, since it uses less digits than its factorization.

31428671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135120.

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

The square root of 31428671 is about 5606.1279864092. The cubic root of 31428671 is about 315.5794189773.

The spelling of 31428671 in words is "thirty-one million, four hundred twenty-eight thousand, six hundred seventy-one".