31825280161 has 4 divisors (see below), whose sum is σ = 32009241492. Its totient is φ = 31641318832.

The previous prime is 31825280107. The next prime is 31825280167. The reversal of 31825280161 is 16108252813.

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 28037493136 + 3787787025 = 167444^2 + 61545^2 .

It is a cyclic number.

It is not a de Polignac number, because 31825280161 - 2⁷ = 31825280033 is a prime.

It is a super-2 number, since 2×31825280161² (a number of 22 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 31825280161.

It is not an unprimeable number, because it can be changed into a prime (31825280167) 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, 91980406 + ... + 91980751.

It is an arithmetic number, because the mean of its divisors is an integer number (8002310373).

Almost surely, 2^31825280161 is an apocalyptic number.

It is an amenable number.

31825280161 is a deficient number, since it is larger than the sum of its proper divisors (183961331).

31825280161 is a wasteful number, since it uses less digits than its factorization.

31825280161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183961330.

The product of its (nonzero) digits is 23040, while the sum is 37.

The spelling of 31825280161 in words is "thirty-one billion, eight hundred twenty-five million, two hundred eighty thousand, one hundred sixty-one".