31380046 has 4 divisors (see below), whose sum is σ = 47070072. Its totient is φ = 15690022.

The previous prime is 31380031. The next prime is 31380101. The reversal of 31380046 is 64008313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64008313 = 47 ⋅1361879.

It is a self number, because there is not a number n which added to its sum of digits gives 31380046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7845010 + ... + 7845013.

It is an arithmetic number, because the mean of its divisors is an integer number (11767518).

Almost surely, 2^31380046 is an apocalyptic number.

31380046 is a deficient number, since it is larger than the sum of its proper divisors (15690026).

31380046 is a wasteful number, since it uses less digits than its factorization.

31380046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15690025.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 31380046 is about 5601.7895354967. The cubic root of 31380046 is about 315.4165849653.

Adding to 31380046 its reverse (64008313), we get a palindrome (95388359).

The spelling of 31380046 in words is "thirty-one million, three hundred eighty thousand, forty-six".