2145539987 has 2 divisors, whose sum is σ = 2145539988. Its totient is φ = 2145539986.

The previous prime is 2145539969. The next prime is 2145540043. The reversal of 2145539987 is 7899355412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2145539987 - 2¹² = 2145535891 is a prime.

It is a super-3 number, since 3×2145539987³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (2145539687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072769993 + 1072769994.

It is an arithmetic number, because the mean of its divisors is an integer number (1072769994).

Almost surely, 2^2145539987 is an apocalyptic number.

2145539987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145539987 is an equidigital number, since it uses as much as digits as its factorization.

2145539987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2721600, while the sum is 53.

The square root of 2145539987 is about 46319.9739529288. The cubic root of 2145539987 is about 1289.7698018822.

The spelling of 2145539987 in words is "two billion, one hundred forty-five million, five hundred thirty-nine thousand, nine hundred eighty-seven".