43487161 has 2 divisors, whose sum is σ = 43487162. Its totient is φ = 43487160.

The previous prime is 43487149. The next prime is 43487167. The reversal of 43487161 is 16178434.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41473600 + 2013561 = 6440^2 + 1419^2 .

It is a cyclic number.

It is not a de Polignac number, because 43487161 - 2¹⁵ = 43454393 is a prime.

It is a super-2 number, since 2×43487161² = 3782266343679842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43487167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21743580 + 21743581.

It is an arithmetic number, because the mean of its divisors is an integer number (21743581).

Almost surely, 2^43487161 is an apocalyptic number.

It is an amenable number.

43487161 is a deficient number, since it is larger than the sum of its proper divisors (1).

43487161 is an equidigital number, since it uses as much as digits as its factorization.

43487161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 34.

The square root of 43487161 is about 6594.4795852288. The cubic root of 43487161 is about 351.6578787838.

It can be divided in two parts, 43 and 487161, that added together give a square (487204 = 698²).

The spelling of 43487161 in words is "forty-three million, four hundred eighty-seven thousand, one hundred sixty-one".