1672021161 has 12 divisors (see below), whose sum is σ = 2423012592. Its totient is φ = 1111048056.

The previous prime is 1672021081. The next prime is 1672021171. The reversal of 1672021161 is 1611202761.

It is a happy number.

It is not a de Polignac number, because 1672021161 - 2¹⁴ = 1672004777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1672021171) by changing a digit.

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, 299811 + ... + 305336.

It is an arithmetic number, because the mean of its divisors is an integer number (201917716).

Almost surely, 2^1672021161 is an apocalyptic number.

It is an amenable number.

1672021161 is a deficient number, since it is larger than the sum of its proper divisors (750991431).

1672021161 is a wasteful number, since it uses less digits than its factorization.

1672021161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605460 (or 605457 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 1672021161 is about 40890.3553542886. The cubic root of 1672021161 is about 1186.8994352106.

The spelling of 1672021161 in words is "one billion, six hundred seventy-two million, twenty-one thousand, one hundred sixty-one".