311377533509 has 6 divisors (see below), whose sum is σ = 362214681894. Its totient is φ = 266895028680.

The previous prime is 311377533497. The next prime is 311377533529. The reversal of 311377533509 is 905335773113.

It can be written as a sum of positive squares in only one way, i.e., 262044681409 + 49332852100 = 511903^2 + 222110^2 .

It is not a de Polignac number, because 311377533509 - 2¹² = 311377529413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311377533529) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3177321722 + ... + 3177321819.

It is an arithmetic number, because the mean of its divisors is an integer number (60369113649).

Almost surely, 2^311377533509 is an apocalyptic number.

It is an amenable number.

311377533509 is a deficient number, since it is larger than the sum of its proper divisors (50837148385).

311377533509 is an equidigital number, since it uses as much as digits as its factorization.

311377533509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6354643555 (or 6354643548 counting only the distinct ones).

The product of its (nonzero) digits is 893025, while the sum is 47.

The spelling of 311377533509 in words is "three hundred eleven billion, three hundred seventy-seven million, five hundred thirty-three thousand, five hundred nine".