1387487131 has 2 divisors, whose sum is σ = 1387487132. Its totient is φ = 1387487130.

The previous prime is 1387487117. The next prime is 1387487201. The reversal of 1387487131 is 1317847831.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1387487131 - 2¹¹ = 1387485083 is a prime.

It is a super-2 number, since 2×1387487131² = 3850241077381222322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1387487831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693743565 + 693743566.

It is an arithmetic number, because the mean of its divisors is an integer number (693743566).

Almost surely, 2^1387487131 is an apocalyptic number.

1387487131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387487131 is an equidigital number, since it uses as much as digits as its factorization.

1387487131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112896, while the sum is 43.

The square root of 1387487131 is about 37248.9883218323. The cubic root of 1387487131 is about 1115.3461039549.

The spelling of 1387487131 in words is "one billion, three hundred eighty-seven million, four hundred eighty-seven thousand, one hundred thirty-one".