161025311 has 4 divisors (see below), whose sum is σ = 161094192. Its totient is φ = 160956432.

The previous prime is 161025251. The next prime is 161025341. The reversal of 161025311 is 113520161.

161025311 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 161025311 - 2¹⁰ = 161024287 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 (161025341) 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, 30806 + ... + 35651.

It is an arithmetic number, because the mean of its divisors is an integer number (40273548).

Almost surely, 2^161025311 is an apocalyptic number.

161025311 is a deficient number, since it is larger than the sum of its proper divisors (68881).

161025311 is an equidigital number, since it uses as much as digits as its factorization.

161025311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68880.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 161025311 is about 12689.5748943769. The cubic root of 161025311 is about 544.0406893134.

Adding to 161025311 its reverse (113520161), we get a palindrome (274545472).

The spelling of 161025311 in words is "one hundred sixty-one million, twenty-five thousand, three hundred eleven".