311917990 has 16 divisors (see below), whose sum is σ = 566905248. Its totient is φ = 123555456.

The previous prime is 311917987. The next prime is 311917993. The reversal of 311917990 is 99719113.

It is an interprime number because it is at equal distance from previous prime (311917987) and next prime (311917993).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311917993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150387 + ... + 152446.

It is an arithmetic number, because the mean of its divisors is an integer number (35431578).

Almost surely, 2^311917990 is an apocalyptic number.

311917990 is a deficient number, since it is larger than the sum of its proper divisors (254987258).

311917990 is a wasteful number, since it uses less digits than its factorization.

311917990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302943.

The product of its (nonzero) digits is 15309, while the sum is 40.

The square root of 311917990 is about 17661.2001290966. The cubic root of 311917990 is about 678.1828574871.

The spelling of 311917990 in words is "three hundred eleven million, nine hundred seventeen thousand, nine hundred ninety".