161334451 has 4 divisors (see below), whose sum is σ = 161483152. Its totient is φ = 161185752.

The previous prime is 161334431. The next prime is 161334461. The reversal of 161334451 is 154433161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 154433161 = 11383 ⋅13567.

It is a cyclic number.

It is not a de Polignac number, because 161334451 - 2⁵ = 161334419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161334401) 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, 72711 + ... + 74896.

It is an arithmetic number, because the mean of its divisors is an integer number (40370788).

Almost surely, 2^161334451 is an apocalyptic number.

161334451 is a deficient number, since it is larger than the sum of its proper divisors (148701).

161334451 is a wasteful number, since it uses less digits than its factorization.

161334451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148700.

The product of its digits is 4320, while the sum is 28.

The square root of 161334451 is about 12701.7499188104. The cubic root of 161334451 is about 544.3886205879.

The spelling of 161334451 in words is "one hundred sixty-one million, three hundred thirty-four thousand, four hundred fifty-one".