31555042413 has 4 divisors (see below), whose sum is σ = 42073389888. Its totient is φ = 21036694940.

The previous prime is 31555042403. The next prime is 31555042451. The reversal of 31555042413 is 31424055513.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31424055513 = 3 ⋅10474685171.

It is a cyclic number.

It is not a de Polignac number, because 31555042413 - 2⁵ = 31555042381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31555042403) 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, 5259173733 + ... + 5259173738.

It is an arithmetic number, because the mean of its divisors is an integer number (10518347472).

Almost surely, 2^31555042413 is an apocalyptic number.

It is an amenable number.

31555042413 is a deficient number, since it is larger than the sum of its proper divisors (10518347475).

31555042413 is a wasteful number, since it uses less digits than its factorization.

31555042413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10518347474.

The product of its (nonzero) digits is 36000, while the sum is 33.

Adding to 31555042413 its reverse (31424055513), we get a palindrome (62979097926).

The spelling of 31555042413 in words is "thirty-one billion, five hundred fifty-five million, forty-two thousand, four hundred thirteen".