1311531141 has 8 divisors (see below), whose sum is σ = 1750312480. Its totient is φ = 873551952.

The previous prime is 1311531131. The next prime is 1311531173. The reversal of 1311531141 is 1411351131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1311531141 - 2¹⁰ = 1311530117 is a prime.

It is a super-2 number, since 2×1311531141² = 3440227867625523762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311531101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196711 + ... + 203268.

It is an arithmetic number, because the mean of its divisors is an integer number (218789060).

Almost surely, 2^1311531141 is an apocalyptic number.

It is an amenable number.

1311531141 is a deficient number, since it is larger than the sum of its proper divisors (438781339).

1311531141 is a wasteful number, since it uses less digits than its factorization.

1311531141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401075.

The product of its digits is 180, while the sum is 21.

The square root of 1311531141 is about 36215.0678723650. The cubic root of 1311531141 is about 1094.6103131608.

Adding to 1311531141 its reverse (1411351131), we get a palindrome (2722882272).

The spelling of 1311531141 in words is "one billion, three hundred eleven million, five hundred thirty-one thousand, one hundred forty-one".