987631111 has 2 divisors, whose sum is σ = 987631112. Its totient is φ = 987631110.

The previous prime is 987631103. The next prime is 987631159. The reversal of 987631111 is 111136789.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 987631111 - 2³ = 987631103 is a prime.

It is a super-2 number, since 2×987631111² = 1950830422830188642, which contains 22 as substring.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (987631171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493815555 + 493815556.

It is an arithmetic number, because the mean of its divisors is an integer number (493815556).

Almost surely, 2^987631111 is an apocalyptic number.

987631111 is a deficient number, since it is larger than the sum of its proper divisors (1).

987631111 is an equidigital number, since it uses as much as digits as its factorization.

987631111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 37.

The square root of 987631111 is about 31426.5987819236. The cubic root of 987631111 is about 995.8599203949.

The spelling of 987631111 in words is "nine hundred eighty-seven million, six hundred thirty-one thousand, one hundred eleven".