161049405 has 32 divisors (see below), whose sum is σ = 287654400. Its totient is φ = 76265280.

The previous prime is 161049373. The next prime is 161049407. The reversal of 161049405 is 504940161.

It is a happy number.

It is not a de Polignac number, because 161049405 - 2⁵ = 161049373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161049407) 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, 4255 + ... + 18444.

It is an arithmetic number, because the mean of its divisors is an integer number (8989200).

Almost surely, 2^161049405 is an apocalyptic number.

161049405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161049405 is a deficient number, since it is larger than the sum of its proper divisors (126604995).

161049405 is a wasteful number, since it uses less digits than its factorization.

161049405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22761.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 161049405 is about 12690.5242208508. The cubic root of 161049405 is about 544.0678226516.

Adding to 161049405 its reverse (504940161), we get a palindrome (665989566).

It can be divided in two parts, 1610 and 49405, that added together give a palindrome (51015).

The spelling of 161049405 in words is "one hundred sixty-one million, forty-nine thousand, four hundred five".