31471394 has 4 divisors (see below), whose sum is σ = 47207094. Its totient is φ = 15735696.

The previous prime is 31471387. The next prime is 31471397. The reversal of 31471394 is 49317413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49317413 = 73 ⋅675581.

It can be written as a sum of positive squares in only one way, i.e., 26574025 + 4897369 = 5155^2 + 2213^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31471394.

It is not an unprimeable number, because it can be changed into a prime (31471397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7867847 + ... + 7867850.

Almost surely, 2^31471394 is an apocalyptic number.

31471394 is a deficient number, since it is larger than the sum of its proper divisors (15735700).

31471394 is a wasteful number, since it uses less digits than its factorization.

31471394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15735699.

The product of its digits is 9072, while the sum is 32.

The square root of 31471394 is about 5609.9370762960. The cubic root of 31471394 is about 315.7223499857.

The spelling of 31471394 in words is "thirty-one million, four hundred seventy-one thousand, three hundred ninety-four".