40578213531 has 16 divisors (see below), whose sum is σ = 57200595200. Its totient is φ = 25516423008.

The previous prime is 40578213451. The next prime is 40578213539. The reversal of 40578213531 is 13531287504.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-40578213531 is a prime.

It is a super-2 number, since 2×40578213531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40578213531.

It is not an unprimeable number, because it can be changed into a prime (40578213539) 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 15 ways as a sum of consecutive naturals, for example, 1541311 + ... + 1567416.

It is an arithmetic number, because the mean of its divisors is an integer number (3575037200).

Almost surely, 2^40578213531 is an apocalyptic number.

40578213531 is a deficient number, since it is larger than the sum of its proper divisors (16622381669).

40578213531 is a wasteful number, since it uses less digits than its factorization.

40578213531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3108978.

The product of its (nonzero) digits is 100800, while the sum is 39.

The spelling of 40578213531 in words is "forty billion, five hundred seventy-eight million, two hundred thirteen thousand, five hundred thirty-one".