31220342 has 4 divisors (see below), whose sum is σ = 46830516. Its totient is φ = 15610170.

The previous prime is 31220297. The next prime is 31220377. The reversal of 31220342 is 24302213.

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

It is a self number, because there is not a number n which added to its sum of digits gives 31220342.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7805084 + ... + 7805087.

It is an arithmetic number, because the mean of its divisors is an integer number (11707629).

Almost surely, 2^31220342 is an apocalyptic number.

31220342 is a deficient number, since it is larger than the sum of its proper divisors (15610174).

31220342 is a wasteful number, since it uses less digits than its factorization.

31220342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15610173.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 31220342 is about 5587.5166218992. The cubic root of 31220342 is about 314.8805862983.

Adding to 31220342 its reverse (24302213), we get a palindrome (55522555).

The spelling of 31220342 in words is "thirty-one million, two hundred twenty thousand, three hundred forty-two".