40531861 has 4 divisors (see below), whose sum is σ = 40827852. Its totient is φ = 40235872.

The previous prime is 40531853. The next prime is 40531867. The reversal of 40531861 is 16813504.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12916836 + 27615025 = 3594^2 + 5255^2 .

It is a cyclic number.

It is not a de Polignac number, because 40531861 - 2³ = 40531853 is a prime.

It is a super-2 number, since 2×40531861² = 3285663512246642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40531867) 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, 147790 + ... + 148063.

It is an arithmetic number, because the mean of its divisors is an integer number (10206963).

Almost surely, 2^40531861 is an apocalyptic number.

It is an amenable number.

40531861 is a deficient number, since it is larger than the sum of its proper divisors (295991).

40531861 is a wasteful number, since it uses less digits than its factorization.

40531861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295990.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 40531861 is about 6366.4637751267. The cubic root of 40531861 is about 343.5043028417.

The spelling of 40531861 in words is "forty million, five hundred thirty-one thousand, eight hundred sixty-one".