311947477 has 2 divisors, whose sum is σ = 311947478. Its totient is φ = 311947476.

The previous prime is 311947439. The next prime is 311947487. The reversal of 311947477 is 774749113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176597521 + 135349956 = 13289^2 + 11634^2 .

It is an emirp because it is prime and its reverse (774749113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311947477 - 2¹⁵ = 311914709 is a prime.

It is a super-2 number, since 2×311947477² = 194622456813331058, which contains 22 as substring.

It is equal to p_16863946 and since 311947477 and 16863946 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311947487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155973738 + 155973739.

It is an arithmetic number, because the mean of its divisors is an integer number (155973739).

Almost surely, 2^311947477 is an apocalyptic number.

It is an amenable number.

311947477 is a deficient number, since it is larger than the sum of its proper divisors (1).

311947477 is an equidigital number, since it uses as much as digits as its factorization.

311947477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 148176, while the sum is 43.

The square root of 311947477 is about 17662.0349054122. The cubic root of 311947477 is about 678.2042273647.

The spelling of 311947477 in words is "three hundred eleven million, nine hundred forty-seven thousand, four hundred seventy-seven".