31609055 has 4 divisors (see below), whose sum is σ = 37930872. Its totient is φ = 25287240.

The previous prime is 31609049. The next prime is 31609079. The reversal of 31609055 is 55090613.

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

It is not a de Polignac number, because 31609055 - 2¹² = 31604959 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 3 ways as a sum of consecutive naturals, for example, 3160901 + ... + 3160910.

It is an arithmetic number, because the mean of its divisors is an integer number (9482718).

Almost surely, 2^31609055 is an apocalyptic number.

31609055 is a deficient number, since it is larger than the sum of its proper divisors (6321817).

31609055 is an equidigital number, since it uses as much as digits as its factorization.

31609055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6321816.

The product of its (nonzero) digits is 4050, while the sum is 29.

The square root of 31609055 is about 5622.1930774387. The cubic root of 31609055 is about 316.1820207274.

Adding to 31609055 its reverse (55090613), we get a palindrome (86699668).

The spelling of 31609055 in words is "thirty-one million, six hundred nine thousand, fifty-five".