43261445987 has 2 divisors, whose sum is σ = 43261445988. Its totient is φ = 43261445986.

The previous prime is 43261445951. The next prime is 43261445993. The reversal of 43261445987 is 78954416234.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43261445987 - 2¹² = 43261441891 is a prime.

It is a super-2 number, since 2×43261445987² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43261447987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21630722993 + 21630722994.

It is an arithmetic number, because the mean of its divisors is an integer number (21630722994).

Almost surely, 2^43261445987 is an apocalyptic number.

43261445987 is a deficient number, since it is larger than the sum of its proper divisors (1).

43261445987 is an equidigital number, since it uses as much as digits as its factorization.

43261445987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5806080, while the sum is 53.

The spelling of 43261445987 in words is "forty-three billion, two hundred sixty-one million, four hundred forty-five thousand, nine hundred eighty-seven".