987517331 has 2 divisors, whose sum is σ = 987517332. Its totient is φ = 987517330.

The previous prime is 987517313. The next prime is 987517337. The reversal of 987517331 is 133715789.

Together with previous prime (987517313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 987517331 - 2¹⁸ = 987255187 is a prime.

It is a super-2 number, since 2×987517331² = 1950380958050727122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (987517337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493758665 + 493758666.

It is an arithmetic number, because the mean of its divisors is an integer number (493758666).

Almost surely, 2^987517331 is an apocalyptic number.

987517331 is a deficient number, since it is larger than the sum of its proper divisors (1).

987517331 is an equidigital number, since it uses as much as digits as its factorization.

987517331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 158760, while the sum is 44.

The square root of 987517331 is about 31424.7884797973. The cubic root of 987517331 is about 995.8216762597.

The spelling of 987517331 in words is "nine hundred eighty-seven million, five hundred seventeen thousand, three hundred thirty-one".