1987237243 has 2 divisors, whose sum is σ = 1987237244. Its totient is φ = 1987237242.

The previous prime is 1987237201. The next prime is 1987237327. The reversal of 1987237243 is 3427327891.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1987237243 is a prime.

It is a super-2 number, since 2×1987237243² = 7898223719932482098, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1987237193 and 1987237202.

It is not a weakly prime, because it can be changed into another prime (1987238243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 993618621 + 993618622.

It is an arithmetic number, because the mean of its divisors is an integer number (993618622).

Almost surely, 2^1987237243 is an apocalyptic number.

1987237243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1987237243 is an equidigital number, since it uses as much as digits as its factorization.

1987237243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 46.

The square root of 1987237243 is about 44578.4392167335. The cubic root of 1987237243 is about 1257.2353178435.

The spelling of 1987237243 in words is "one billion, nine hundred eighty-seven million, two hundred thirty-seven thousand, two hundred forty-three".