40531031621 has 2 divisors, whose sum is σ = 40531031622. Its totient is φ = 40531031620.

The previous prime is 40531031581. The next prime is 40531031659. The reversal of 40531031621 is 12613013504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20652851521 + 19878180100 = 143711^2 + 140990^2 .

It is a cyclic number.

It is not a de Polignac number, because 40531031621 - 2¹⁰ = 40531030597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40531030621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20265515810 + 20265515811.

It is an arithmetic number, because the mean of its divisors is an integer number (20265515811).

Almost surely, 2^40531031621 is an apocalyptic number.

It is an amenable number.

40531031621 is a deficient number, since it is larger than the sum of its proper divisors (1).

40531031621 is an equidigital number, since it uses as much as digits as its factorization.

40531031621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The spelling of 40531031621 in words is "forty billion, five hundred thirty-one million, thirty-one thousand, six hundred twenty-one".