31397135 has 16 divisors (see below), whose sum is σ = 46973952. Its totient is φ = 19572000.

The previous prime is 31397129. The next prime is 31397143. The reversal of 31397135 is 53179313.

It is not a de Polignac number, because 31397135 - 2¹⁰ = 31396111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40391 + ... + 41160.

It is an arithmetic number, because the mean of its divisors is an integer number (2935872).

Almost surely, 2^31397135 is an apocalyptic number.

31397135 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

31397135 is a deficient number, since it is larger than the sum of its proper divisors (15576817).

31397135 is a wasteful number, since it uses less digits than its factorization.

31397135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81574.

The product of its digits is 8505, while the sum is 32.

The square root of 31397135 is about 5603.3146440299. The cubic root of 31397135 is about 315.4738312788.

The spelling of 31397135 in words is "thirty-one million, three hundred ninety-seven thousand, one hundred thirty-five".