43251615149 has 2 divisors, whose sum is σ = 43251615150. Its totient is φ = 43251615148.

The previous prime is 43251615119. The next prime is 43251615263. The reversal of 43251615149 is 94151615234.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43251520900 + 94249 = 207970^2 + 307^2 .

It is a cyclic number.

It is not a de Polignac number, because 43251615149 - 2⁸ = 43251614893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43251615119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21625807574 + 21625807575.

It is an arithmetic number, because the mean of its divisors is an integer number (21625807575).

Almost surely, 2^43251615149 is an apocalyptic number.

It is an amenable number.

43251615149 is a deficient number, since it is larger than the sum of its proper divisors (1).

43251615149 is an equidigital number, since it uses as much as digits as its factorization.

43251615149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 41.

The spelling of 43251615149 in words is "forty-three billion, two hundred fifty-one million, six hundred fifteen thousand, one hundred forty-nine".