30321431431 has 4 divisors (see below), whose sum is σ = 30336131232. Its totient is φ = 30306731632.

The previous prime is 30321431411. The next prime is 30321431477. The reversal of 30321431431 is 13413412303.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30321431431 is a prime.

It is a super-2 number, since 2×30321431431² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30321431396 and 30321431405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30321431411) 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, 7346806 + ... + 7350931.

It is an arithmetic number, because the mean of its divisors is an integer number (7584032808).

Almost surely, 2^30321431431 is an apocalyptic number.

30321431431 is a deficient number, since it is larger than the sum of its proper divisors (14699801).

30321431431 is a wasteful number, since it uses less digits than its factorization.

30321431431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14699800.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 30321431431 its reverse (13413412303), we get a palindrome (43734843734).

The spelling of 30321431431 in words is "thirty billion, three hundred twenty-one million, four hundred thirty-one thousand, four hundred thirty-one".