40121431397 has 2 divisors, whose sum is σ = 40121431398. Its totient is φ = 40121431396.

The previous prime is 40121431387. The next prime is 40121431421. The reversal of 40121431397 is 79313412104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25828989796 + 14292441601 = 160714^2 + 119551^2 .

It is a cyclic number.

It is not a de Polignac number, because 40121431397 - 2¹⁶ = 40121365861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40121431387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20060715698 + 20060715699.

It is an arithmetic number, because the mean of its divisors is an integer number (20060715699).

Almost surely, 2^40121431397 is an apocalyptic number.

It is an amenable number.

40121431397 is a deficient number, since it is larger than the sum of its proper divisors (1).

40121431397 is an equidigital number, since it uses as much as digits as its factorization.

40121431397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 35.

The spelling of 40121431397 in words is "forty billion, one hundred twenty-one million, four hundred thirty-one thousand, three hundred ninety-seven".