40721455031 has 4 divisors (see below), whose sum is σ = 40725752352. Its totient is φ = 40717157712.

The previous prime is 40721455003. The next prime is 40721455157. The reversal of 40721455031 is 13055412704.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40721455031 is a prime.

It is a super-2 number, since 2×40721455031² (a number of 22 digits) 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 (40721455331) 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, 2134415 + ... + 2153408.

It is an arithmetic number, because the mean of its divisors is an integer number (10181438088).

Almost surely, 2^40721455031 is an apocalyptic number.

40721455031 is a deficient number, since it is larger than the sum of its proper divisors (4297321).

40721455031 is an equidigital number, since it uses as much as digits as its factorization.

40721455031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4297320.

The product of its (nonzero) digits is 16800, while the sum is 32.

Adding to 40721455031 its reverse (13055412704), we get a palindrome (53776867735).

The spelling of 40721455031 in words is "forty billion, seven hundred twenty-one million, four hundred fifty-five thousand, thirty-one".