311991461 has 8 divisors (see below), whose sum is σ = 317560320. Its totient is φ = 306463248.

The previous prime is 311991413. The next prime is 311991467. The reversal of 311991461 is 164199113.

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 311991461 - 2¹⁴ = 311975077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311991467) 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, 5540 + ... + 25586.

It is an arithmetic number, because the mean of its divisors is an integer number (39695040).

Almost surely, 2^311991461 is an apocalyptic number.

It is an amenable number.

311991461 is a deficient number, since it is larger than the sum of its proper divisors (5568859).

311991461 is a wasteful number, since it uses less digits than its factorization.

311991461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20323.

The product of its digits is 5832, while the sum is 35.

The square root of 311991461 is about 17663.2800181620. The cubic root of 311991461 is about 678.2361010347.

The spelling of 311991461 in words is "three hundred eleven million, nine hundred ninety-one thousand, four hundred sixty-one".