40121611987 has 2 divisors, whose sum is σ = 40121611988. Its totient is φ = 40121611986.

The previous prime is 40121611973. The next prime is 40121612131. The reversal of 40121611987 is 78911612104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40121611987 - 2¹⁵ = 40121579219 is a prime.

It is not a weakly prime, because it can be changed into another prime (40121611927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20060805993 + 20060805994.

It is an arithmetic number, because the mean of its divisors is an integer number (20060805994).

Almost surely, 2^40121611987 is an apocalyptic number.

40121611987 is a deficient number, since it is larger than the sum of its proper divisors (1).

40121611987 is an equidigital number, since it uses as much as digits as its factorization.

40121611987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 40.

The spelling of 40121611987 in words is "forty billion, one hundred twenty-one million, six hundred eleven thousand, nine hundred eighty-seven".