311421131 has 4 divisors (see below), whose sum is σ = 355909872. Its totient is φ = 266932392.

The previous prime is 311421109. The next prime is 311421137. The reversal of 311421131 is 131124113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131124113 = 107 ⋅1225459.

It is a cyclic number.

It is not a de Polignac number, because 311421131 - 2⁶ = 311421067 is a prime.

It is a super-2 number, since 2×311421131² = 193966241666638322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311421137) 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, 22244360 + ... + 22244373.

It is an arithmetic number, because the mean of its divisors is an integer number (88977468).

Almost surely, 2^311421131 is an apocalyptic number.

311421131 is a deficient number, since it is larger than the sum of its proper divisors (44488741).

311421131 is an equidigital number, since it uses as much as digits as its factorization.

311421131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44488740.

The product of its digits is 72, while the sum is 17.

The square root of 311421131 is about 17647.1281232953. The cubic root of 311421131 is about 677.8225701224.

Adding to 311421131 its reverse (131124113), we get a palindrome (442545244).

The spelling of 311421131 in words is "three hundred eleven million, four hundred twenty-one thousand, one hundred thirty-one".