311742021 has 8 divisors (see below), whose sum is σ = 418059360. Its totient is φ = 206626352.

The previous prime is 311742019. The next prime is 311742037. The reversal of 311742021 is 120247113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 311742021 - 2¹ = 311742019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311742001) 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 in 7 ways as a sum of consecutive naturals, for example, 299811 + ... + 300848.

It is an arithmetic number, because the mean of its divisors is an integer number (52257420).

Almost surely, 2^311742021 is an apocalyptic number.

It is an amenable number.

311742021 is a deficient number, since it is larger than the sum of its proper divisors (106317339).

311742021 is a wasteful number, since it uses less digits than its factorization.

311742021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600835.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 311742021 is about 17656.2176300588. The cubic root of 311742021 is about 678.0553008730.

Adding to 311742021 its reverse (120247113), we get a palindrome (431989134).

The spelling of 311742021 in words is "three hundred eleven million, seven hundred forty-two thousand, twenty-one".