31397019 has 4 divisors (see below), whose sum is σ = 41862696. Its totient is φ = 20931344.

The previous prime is 31396999. The next prime is 31397029. The reversal of 31397019 is 91079313.

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 31397019 - 2⁹ = 31396507 is a prime.

It is a super-2 number, since 2×31397019² = 1971545604172722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31397029) 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, 5232834 + ... + 5232839.

It is an arithmetic number, because the mean of its divisors is an integer number (10465674).

Almost surely, 2^31397019 is an apocalyptic number.

31397019 is a deficient number, since it is larger than the sum of its proper divisors (10465677).

31397019 is a wasteful number, since it uses less digits than its factorization.

31397019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10465676.

The product of its (nonzero) digits is 5103, while the sum is 33.

The square root of 31397019 is about 5603.3042930043. The cubic root of 31397019 is about 315.4734427613.

The spelling of 31397019 in words is "thirty-one million, three hundred ninety-seven thousand, nineteen".