2101311031 has 2 divisors, whose sum is σ = 2101311032. Its totient is φ = 2101311030.

The previous prime is 2101311013. The next prime is 2101311071. The reversal of 2101311031 is 1301131012.

Together with previous prime (2101311013) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2101311031 - 2¹¹ = 2101308983 is a prime.

It is a super-2 number, since 2×2101311031² = 8831016098004565922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101311001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050655515 + 1050655516.

It is an arithmetic number, because the mean of its divisors is an integer number (1050655516).

Almost surely, 2^2101311031 is an apocalyptic number.

2101311031 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101311031 is an equidigital number, since it uses as much as digits as its factorization.

2101311031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 2101311031 is about 45840.0592386179. The cubic root of 2101311031 is about 1280.8455982779.

Adding to 2101311031 its reverse (1301131012), we get a palindrome (3402442043).

The spelling of 2101311031 in words is "two billion, one hundred one million, three hundred eleven thousand, thirty-one".