40261531 has 2 divisors, whose sum is σ = 40261532. Its totient is φ = 40261530.

The previous prime is 40261453. The next prime is 40261547. The reversal of 40261531 is 13516204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40261531 - 2¹⁵ = 40228763 is a prime.

It is a super-2 number, since 2×40261531² = 3241981756927922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40261231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20130765 + 20130766.

It is an arithmetic number, because the mean of its divisors is an integer number (20130766).

Almost surely, 2^40261531 is an apocalyptic number.

40261531 is a deficient number, since it is larger than the sum of its proper divisors (1).

40261531 is an equidigital number, since it uses as much as digits as its factorization.

40261531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 40261531 is about 6345.1974752564. The cubic root of 40261531 is about 342.7389236352.

Adding to 40261531 its reverse (13516204), we get a palindrome (53777735).

The spelling of 40261531 in words is "forty million, two hundred sixty-one thousand, five hundred thirty-one".