311697773401 has 9 divisors (see below), whose sum is σ = 362591751999. Its totient is φ = 267166170264.

The previous prime is 311697773399. The next prime is 311697773441. The reversal of 311697773401 is 104377796113.

It is a happy number.

The square root of 311697773401 is 558299.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 206802110025 + 104895663376 = 454755^2 + 323876^2 .

It is not a de Polignac number, because 311697773401 - 2¹ = 311697773399 is a prime.

It is a super-2 number, since 2×311697773401² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311697773441) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3868215 + ... + 3947971.

Almost surely, 2^311697773401 is an apocalyptic number.

311697773401 is the 558299-th square number.

311697773401 is the 279150-th centered octagonal number.

It is an amenable number.

311697773401 is a deficient number, since it is larger than the sum of its proper divisors (50893978598).

311697773401 is an frugal number, since it uses more digits than its factorization.

311697773401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159528 (or 79764 counting only the distinct ones).

The product of its (nonzero) digits is 666792, while the sum is 49.

Multiplying 311697773401 by its sum of digits (49), we get a square (15273190896649 = 3908093²).

311697773401 divided by its sum of digits (49) gives a square (6361179049 = 79757²).

The spelling of 311697773401 in words is "three hundred eleven billion, six hundred ninety-seven million, seven hundred seventy-three thousand, four hundred one".