31139455 has 4 divisors (see below), whose sum is σ = 37367352. Its totient is φ = 24911560.

The previous prime is 31139453. The next prime is 31139467. The reversal of 31139455 is 55493113.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 31139455 - 2¹ = 31139453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31139453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3113941 + ... + 3113950.

It is an arithmetic number, because the mean of its divisors is an integer number (9341838).

Almost surely, 2^31139455 is an apocalyptic number.

31139455 is a deficient number, since it is larger than the sum of its proper divisors (6227897).

31139455 is an equidigital number, since it uses as much as digits as its factorization.

31139455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6227896.

The product of its digits is 8100, while the sum is 31.

The square root of 31139455 is about 5580.2737388053. The cubic root of 31139455 is about 314.6084157400.

The spelling of 31139455 in words is "thirty-one million, one hundred thirty-nine thousand, four hundred fifty-five".