31720055 has 16 divisors (see below), whose sum is σ = 39566880. Its totient is φ = 24382848.

The previous prime is 31720049. The next prime is 31720103. The reversal of 31720055 is 55002713.

It is a cyclic number.

It is not a de Polignac number, because 31720055 - 2⁶ = 31719991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31720055.

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, 40649 + ... + 41421.

It is an arithmetic number, because the mean of its divisors is an integer number (2472930).

Almost surely, 2^31720055 is an apocalyptic number.

31720055 is a deficient number, since it is larger than the sum of its proper divisors (7846825).

31720055 is a wasteful number, since it uses less digits than its factorization.

31720055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090.

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 31720055 is about 5632.0560188975. The cubic root of 31720055 is about 316.5516954127.

Adding to 31720055 its reverse (55002713), we get a palindrome (86722768).

The spelling of 31720055 in words is "thirty-one million, seven hundred twenty thousand, fifty-five".