161404749 has 48 divisors (see below), whose sum is σ = 278665920. Its totient is φ = 88865280.

The previous prime is 161404723. The next prime is 161404751. The reversal of 161404749 is 947404161.

It is not a de Polignac number, because 161404749 - 2⁸ = 161404493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161404709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 47154 + ... + 50460.

It is an arithmetic number, because the mean of its divisors is an integer number (5805540).

Almost surely, 2^161404749 is an apocalyptic number.

It is an amenable number.

161404749 is a deficient number, since it is larger than the sum of its proper divisors (117261171).

161404749 is a wasteful number, since it uses less digits than its factorization.

161404749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3370 (or 3367 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 161404749 is about 12704.5168739311. The cubic root of 161404749 is about 544.4676776317.

The spelling of 161404749 in words is "one hundred sixty-one million, four hundred four thousand, seven hundred forty-nine".