42991311 has 32 divisors (see below), whose sum is σ = 65318400. Its totient is φ = 24913280.

The previous prime is 42991309. The next prime is 42991313. The reversal of 42991311 is 11319924.

It is an interprime number because it is at equal distance from previous prime (42991309) and next prime (42991313).

It is a cyclic number.

It is not a de Polignac number, because 42991311 - 2¹ = 42991309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42991313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 159685 + ... + 159953.

It is an arithmetic number, because the mean of its divisors is an integer number (2041200).

Almost surely, 2^42991311 is an apocalyptic number.

42991311 is a deficient number, since it is larger than the sum of its proper divisors (22327089).

42991311 is a wasteful number, since it uses less digits than its factorization.

42991311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479.

The product of its digits is 1944, while the sum is 30.

The square root of 42991311 is about 6556.7759607905. The cubic root of 42991311 is about 350.3162067547.

It can be divided in two parts, 429913 and 11, that added together give a palindrome (429924).

The spelling of 42991311 in words is "forty-two million, nine hundred ninety-one thousand, three hundred eleven".