31423258 has 4 divisors (see below), whose sum is σ = 47134890. Its totient is φ = 15711628.

The previous prime is 31423253. The next prime is 31423291. The reversal of 31423258 is 85232413.

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

It can be written as a sum of positive squares in only one way, i.e., 30327049 + 1096209 = 5507^2 + 1047^2 .

It is a super-5 number, since 5×31423258⁵ (a number of 39 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (31423253) 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 as a sum of consecutive naturals, namely, 7855813 + ... + 7855816.

Almost surely, 2^31423258 is an apocalyptic number.

31423258 is a deficient number, since it is larger than the sum of its proper divisors (15711632).

31423258 is a wasteful number, since it uses less digits than its factorization.

31423258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15711631.

The product of its digits is 5760, while the sum is 28.

The square root of 31423258 is about 5605.6451903416. The cubic root of 31423258 is about 315.5613003888.

It can be divided in two parts, 3142 and 3258, that added together give a square (6400 = 80²).

The spelling of 31423258 in words is "thirty-one million, four hundred twenty-three thousand, two hundred fifty-eight".