31479919 has 4 divisors (see below), whose sum is σ = 31562496. Its totient is φ = 31397344.

The previous prime is 31479881. The next prime is 31479947. The reversal of 31479919 is 91997413.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91997413 = 181 ⋅508273.

It is a cyclic number.

It is not a de Polignac number, because 31479919 - 2¹¹ = 31477871 is a prime.

It is a super-2 number, since 2×31479919² = 1981970600493122, 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 (31479949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40714 + ... + 41479.

It is an arithmetic number, because the mean of its divisors is an integer number (7890624).

Almost surely, 2^31479919 is an apocalyptic number.

31479919 is a deficient number, since it is larger than the sum of its proper divisors (82577).

31479919 is an equidigital number, since it uses as much as digits as its factorization.

31479919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82576.

The product of its digits is 61236, while the sum is 43.

The square root of 31479919 is about 5610.6968372921. The cubic root of 31479919 is about 315.7508551317.

The spelling of 31479919 in words is "thirty-one million, four hundred seventy-nine thousand, nine hundred nineteen".