201311023 has 4 divisors (see below), whose sum is σ = 211906360. Its totient is φ = 190715688.

The previous prime is 201311003. The next prime is 201311029. The reversal of 201311023 is 320113102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201311023 - 2⁹ = 201310511 is a prime.

It is a super-2 number, since 2×201311023² = 81052255962613058, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201310994 and 201311012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201311029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5297640 + ... + 5297677.

It is an arithmetic number, because the mean of its divisors is an integer number (52976590).

Almost surely, 2^201311023 is an apocalyptic number.

201311023 is a deficient number, since it is larger than the sum of its proper divisors (10595337).

201311023 is a wasteful number, since it uses less digits than its factorization.

201311023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10595336.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 201311023 is about 14188.4115742390. The cubic root of 201311023 is about 586.0785838537.

Adding to 201311023 its reverse (320113102), we get a palindrome (521424125).

The spelling of 201311023 in words is "two hundred one million, three hundred eleven thousand, twenty-three".