31434525002161 has 4 divisors (see below), whose sum is σ = 31434833791012. Its totient is φ = 31434216213312.

The previous prime is 31434525002147. The next prime is 31434525002171. The reversal of 31434525002161 is 16120052543413.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9293321765025 + 22141203237136 = 3048495^2 + 4705444^2 .

It is a cyclic number.

It is not a de Polignac number, because 31434525002161 - 2⁵ = 31434525002129 is a prime.

It is a super-2 number, since 2×31434525002161² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31434525002161.

It is not an unprimeable number, because it can be changed into a prime (31434525002171) 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, 154241676 + ... + 154445341.

It is an arithmetic number, because the mean of its divisors is an integer number (7858708447753).

Almost surely, 2^{31434525002161} is an apocalyptic number.

It is an amenable number.

31434525002161 is a deficient number, since it is larger than the sum of its proper divisors (308788851).

31434525002161 is a wasteful number, since it uses less digits than its factorization.

31434525002161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308788850.

The product of its (nonzero) digits is 86400, while the sum is 37.

Adding to 31434525002161 its reverse (16120052543413), we get a palindrome (47554577545574).

The spelling of 31434525002161 in words is "thirty-one trillion, four hundred thirty-four billion, five hundred twenty-five million, two thousand, one hundred sixty-one".