31355146 has 4 divisors (see below), whose sum is σ = 47032722. Its totient is φ = 15677572.

The previous prime is 31355143. The next prime is 31355161. The reversal of 31355146 is 64155313.

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., 25050025 + 6305121 = 5005^2 + 2511^2 .

It is not an unprimeable number, because it can be changed into a prime (31355143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7838785 + ... + 7838788.

Almost surely, 2^31355146 is an apocalyptic number.

31355146 is a deficient number, since it is larger than the sum of its proper divisors (15677576).

31355146 is a wasteful number, since it uses less digits than its factorization.

31355146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15677575.

The product of its digits is 5400, while the sum is 28.

The square root of 31355146 is about 5599.5665903711. The cubic root of 31355146 is about 315.3331354251. Note that the first 3 decimals are identical.

It can be divided in two parts, 3135 and 5146, that added together give a square (8281 = 91²).

The spelling of 31355146 in words is "thirty-one million, three hundred fifty-five thousand, one hundred forty-six".