1311023401 has 4 divisors (see below), whose sum is σ = 1322625492. Its totient is φ = 1299421312.

The previous prime is 1311023383. The next prime is 1311023419. The reversal of 1311023401 is 1043201131.

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

It is an interprime number because it is at equal distance from previous prime (1311023383) and next prime (1311023419).

It can be written as a sum of positive squares in 2 ways, for example, as 327573801 + 983449600 = 18099^2 + 31360^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311023401 - 2⁵ = 1311023369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311023471) 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, 5800876 + ... + 5801101.

It is an arithmetic number, because the mean of its divisors is an integer number (330656373).

Almost surely, 2^1311023401 is an apocalyptic number.

It is an amenable number.

1311023401 is a deficient number, since it is larger than the sum of its proper divisors (11602091).

1311023401 is a wasteful number, since it uses less digits than its factorization.

1311023401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11602090.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1311023401 is about 36208.0571282139. The cubic root of 1311023401 is about 1094.4690408319.

Adding to 1311023401 its reverse (1043201131), we get a palindrome (2354224532).

The spelling of 1311023401 in words is "one billion, three hundred eleven million, twenty-three thousand, four hundred one".