5311111381 has 2 divisors, whose sum is σ = 5311111382. Its totient is φ = 5311111380.

The previous prime is 5311111307. The next prime is 5311111409. The reversal of 5311111381 is 1831111135.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3157316100 + 2153795281 = 56190^2 + 46409^2 .

It is a cyclic number.

It is not a de Polignac number, because 5311111381 - 2¹¹ = 5311109333 is a prime.

It is a super-2 number, since 2×5311111381² = 56415808202775454322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5311111181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2655555690 + 2655555691.

It is an arithmetic number, because the mean of its divisors is an integer number (2655555691).

Almost surely, 2^5311111381 is an apocalyptic number.

It is an amenable number.

5311111381 is a deficient number, since it is larger than the sum of its proper divisors (1).

5311111381 is an equidigital number, since it uses as much as digits as its factorization.

5311111381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 25.

The square root of 5311111381 is about 72877.3722152494. The cubic root of 5311111381 is about 1744.7309685056.

The spelling of 5311111381 in words is "five billion, three hundred eleven million, one hundred eleven thousand, three hundred eighty-one".