31400406434 has 4 divisors (see below), whose sum is σ = 47100609654. Its totient is φ = 15700203216.

The previous prime is 31400406379. The next prime is 31400406517. The reversal of 31400406434 is 43460400413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43460400413 = 29 ⋅1498634497.

It can be written as a sum of positive squares in only one way, i.e., 18010445209 + 13389961225 = 134203^2 + 115715^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31400406397 and 31400406406.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7850101607 + ... + 7850101610.

Almost surely, 2^31400406434 is an apocalyptic number.

31400406434 is a deficient number, since it is larger than the sum of its proper divisors (15700203220).

31400406434 is a wasteful number, since it uses less digits than its factorization.

31400406434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15700203219.

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 31400406434 its reverse (43460400413), we get a palindrome (74860806847).

The spelling of 31400406434 in words is "thirty-one billion, four hundred million, four hundred six thousand, four hundred thirty-four".