40802161 has 4 divisors (see below), whose sum is σ = 42576192. Its totient is φ = 39028132.

The previous prime is 40802149. The next prime is 40802173. The reversal of 40802161 is 16120804.

40802161 = T₅₂₁₄ + T₅₂₁₅ + T₅₂₁₆.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (40802149) and next prime (40802173).

It is a cyclic number.

It is not a de Polignac number, because 40802161 - 2¹¹ = 40800113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40802131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 886981 + ... + 887026.

It is an arithmetic number, because the mean of its divisors is an integer number (10644048).

Almost surely, 2^40802161 is an apocalyptic number.

40802161 is the 5216-th centered triangular number.

It is an amenable number.

40802161 is a deficient number, since it is larger than the sum of its proper divisors (1774031).

40802161 is a wasteful number, since it uses less digits than its factorization.

40802161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1774030.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 40802161 is about 6387.6569256653. The cubic root of 40802161 is about 344.2662020292.

Adding to 40802161 its reverse (16120804), we get a palindrome (56922965).

It can be divided in two parts, 4080 and 2161, that added together give a square (6241 = 79²).

The spelling of 40802161 in words is "forty million, eight hundred two thousand, one hundred sixty-one".