31402161173 has 4 divisors (see below), whose sum is σ = 31414090188. Its totient is φ = 31390232160.

The previous prime is 31402161163. The next prime is 31402161199. The reversal of 31402161173 is 37116120413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37116120413 = 43 ⋅863165591.

It can be written as a sum of positive squares in 2 ways, for example, as 16209873124 + 15192288049 = 127318^2 + 123257^2 .

It is a cyclic number.

It is not a de Polignac number, because 31402161173 - 2⁸ = 31402160917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31402161163) 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, 5960558 + ... + 5965823.

It is an arithmetic number, because the mean of its divisors is an integer number (7853522547).

Almost surely, 2^31402161173 is an apocalyptic number.

It is an amenable number.

31402161173 is a deficient number, since it is larger than the sum of its proper divisors (11929015).

31402161173 is a wasteful number, since it uses less digits than its factorization.

31402161173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11929014.

The product of its (nonzero) digits is 3024, while the sum is 29.

Adding to 31402161173 its reverse (37116120413), we get a palindrome (68518281586).

It can be divided in two parts, 31 and 402161173, that added together give a palindrome (402161204).

The spelling of 31402161173 in words is "thirty-one billion, four hundred two million, one hundred sixty-one thousand, one hundred seventy-three".