161023011 has 4 divisors (see below), whose sum is σ = 214697352. Its totient is φ = 107348672.

The previous prime is 161022991. The next prime is 161023019. The reversal of 161023011 is 110320161.

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 161023011 - 2⁶ = 161022947 is a prime.

It is a super-2 number, since 2×161023011² = 51856820143012242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161023019) 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, 26837166 + ... + 26837171.

It is an arithmetic number, because the mean of its divisors is an integer number (53674338).

Almost surely, 2^161023011 is an apocalyptic number.

161023011 is a deficient number, since it is larger than the sum of its proper divisors (53674341).

161023011 is an equidigital number, since it uses as much as digits as its factorization.

161023011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53674340.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 161023011 is about 12689.4842684799. The cubic root of 161023011 is about 544.0380990383.

Adding to 161023011 its reverse (110320161), we get a palindrome (271343172).

The spelling of 161023011 in words is "one hundred sixty-one million, twenty-three thousand, eleven".