40051531 has 4 divisors (see below), whose sum is σ = 43132432. Its totient is φ = 36970632.

The previous prime is 40051519. The next prime is 40051559. The reversal of 40051531 is 13515004.

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

It is a cyclic number.

It is not a de Polignac number, because 40051531 - 2¹¹ = 40049483 is a prime.

It is a super-2 number, since 2×40051531² = 3208250270887922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40051499 and 40051508.

It is not an unprimeable number, because it can be changed into a prime (40051511) 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, 1540431 + ... + 1540456.

It is an arithmetic number, because the mean of its divisors is an integer number (10783108).

Almost surely, 2^40051531 is an apocalyptic number.

40051531 is a deficient number, since it is larger than the sum of its proper divisors (3080901).

40051531 is a wasteful number, since it uses less digits than its factorization.

40051531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3080900.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 40051531 is about 6328.6278923634. The cubic root of 40051531 is about 342.1419875987.

Adding to 40051531 its reverse (13515004), we get a palindrome (53566535).

The spelling of 40051531 in words is "forty million, fifty-one thousand, five hundred thirty-one".