43001902161 has 15 divisors (see below), whose sum is σ = 64240197483. Its totient is φ = 28666690560.

The previous prime is 43001902129. The next prime is 43001902199. The reversal of 43001902161 is 16120910034.

The square root of 43001902161 is 207369.

It is a perfect power (a square), and thus also a powerful number.

43001902161 is a `hidden beast` number, since 430 + 0 + 19 + 0 + 216 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 8495124561 + 34506777600 = 92169^2 + 185760^2 .

It is not a de Polignac number, because 43001902161 - 2⁵ = 43001902129 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (43001902661) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1854801 + ... + 1877841.

Almost surely, 2^43001902161 is an apocalyptic number.

43001902161 is the 207369-th square number.

43001902161 is the 103685-th centered octagonal number.

It is an amenable number.

43001902161 is a deficient number, since it is larger than the sum of its proper divisors (21238295322).

43001902161 is an frugal number, since it uses more digits than its factorization.

43001902161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46094 (or 23044 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

Multiplying 43001902161 by its product of nonzero digits (1296), we get a square (55730465200656 = 7465284²).

The spelling of 43001902161 in words is "forty-three billion, one million, nine hundred two thousand, one hundred sixty-one".