161540554 has 24 divisors (see below), whose sum is σ = 284046048. Its totient is φ = 68697720.

The previous prime is 161540539. The next prime is 161540567. The reversal of 161540554 is 455045161.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6547 + ... + 19129.

It is an arithmetic number, because the mean of its divisors is an integer number (11835252).

Almost surely, 2^161540554 is an apocalyptic number.

161540554 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

161540554 is a deficient number, since it is larger than the sum of its proper divisors (122505494).

161540554 is a wasteful number, since it uses less digits than its factorization.

161540554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12730 (or 12723 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 161540554 is about 12709.8605027750. The cubic root of 161540554 is about 544.6203387835.

The spelling of 161540554 in words is "one hundred sixty-one million, five hundred forty thousand, five hundred fifty-four".