1013205881 has 4 divisors (see below), whose sum is σ = 1019422032. Its totient is φ = 1006989732.

The previous prime is 1013205877. The next prime is 1013205911. The reversal of 1013205881 is 1885023101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1013205881 - 2² = 1013205877 is a prime.

It is a super-3 number, since 3×1013205881³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1013205871) 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, 3107831 + ... + 3108156.

It is an arithmetic number, because the mean of its divisors is an integer number (254855508).

Almost surely, 2^1013205881 is an apocalyptic number.

It is an amenable number.

1013205881 is a deficient number, since it is larger than the sum of its proper divisors (6216151).

1013205881 is an equidigital number, since it uses as much as digits as its factorization.

1013205881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6216150.

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 1013205881 is about 31830.8950706699. The cubic root of 1013205881 is about 1004.3827240021.

Adding to 1013205881 its reverse (1885023101), we get a palindrome (2898228982).

The spelling of 1013205881 in words is "one billion, thirteen million, two hundred five thousand, eight hundred eighty-one".