161234091 has 32 divisors (see below), whose sum is σ = 243432000. Its totient is φ = 105456384.

The previous prime is 161234081. The next prime is 161234107. The reversal of 161234091 is 190432161.

161234091 is a `hidden beast` number, since 1 + 612 + 3 + 40 + 9 + 1 = 666.

It is not a de Polignac number, because 161234091 - 2¹⁸ = 160971947 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (161234081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 550141 + ... + 550433.

It is an arithmetic number, because the mean of its divisors is an integer number (7607250).

Almost surely, 2^161234091 is an apocalyptic number.

161234091 is a deficient number, since it is larger than the sum of its proper divisors (82197909).

161234091 is a wasteful number, since it uses less digits than its factorization.

161234091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620 (or 614 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 161234091 is about 12697.7986674856. The cubic root of 161234091 is about 544.2757160506.

The spelling of 161234091 in words is "one hundred sixty-one million, two hundred thirty-four thousand, ninety-one".