2391885521 has 2 divisors, whose sum is σ = 2391885522. Its totient is φ = 2391885520.

The previous prime is 2391885493. The next prime is 2391885539. The reversal of 2391885521 is 1255881932.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2263380625 + 128504896 = 47575^2 + 11336^2 .

It is a cyclic number.

It is not a de Polignac number, because 2391885521 - 2¹⁰ = 2391884497 is a prime.

It is a super-2 number, since 2×2391885521² = 11442232691138882882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2391885541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1195942760 + 1195942761.

It is an arithmetic number, because the mean of its divisors is an integer number (1195942761).

Almost surely, 2^2391885521 is an apocalyptic number.

It is an amenable number.

2391885521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2391885521 is an equidigital number, since it uses as much as digits as its factorization.

2391885521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172800, while the sum is 44.

The square root of 2391885521 is about 48906.9066799363. The cubic root of 2391885521 is about 1337.3552798375.

The spelling of 2391885521 in words is "two billion, three hundred ninety-one million, eight hundred eighty-five thousand, five hundred twenty-one".