2154311431 has 4 divisors (see below), whose sum is σ = 2154431664. Its totient is φ = 2154191200.

The previous prime is 2154311329. The next prime is 2154311443. The reversal of 2154311431 is 1341134512.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2154311431 - 2²¹ = 2152214279 is a prime.

It is a super-2 number, since 2×2154311431² = 9282115483474535522, 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 = 2154311396 and 2154311405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154321431) 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, 27250 + ... + 71071.

It is an arithmetic number, because the mean of its divisors is an integer number (538607916).

Almost surely, 2^2154311431 is an apocalyptic number.

2154311431 is a deficient number, since it is larger than the sum of its proper divisors (120233).

2154311431 is an equidigital number, since it uses as much as digits as its factorization.

2154311431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120232.

The product of its digits is 1440, while the sum is 25.

The square root of 2154311431 is about 46414.5605494655. The cubic root of 2154311431 is about 1291.5250339290.

Adding to 2154311431 its reverse (1341134512), we get a palindrome (3495445943).

The spelling of 2154311431 in words is "two billion, one hundred fifty-four million, three hundred eleven thousand, four hundred thirty-one".