988156391 has 2 divisors, whose sum is σ = 988156392. Its totient is φ = 988156390.

The previous prime is 988156381. The next prime is 988156441. The reversal of 988156391 is 193651889.

It is a happy number.

It is an a-pointer prime, because the next prime (988156441) can be obtained adding 988156391 to its sum of digits (50).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 988156391 - 2¹⁸ = 987894247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (988156321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494078195 + 494078196.

It is an arithmetic number, because the mean of its divisors is an integer number (494078196).

Almost surely, 2^988156391 is an apocalyptic number.

988156391 is a deficient number, since it is larger than the sum of its proper divisors (1).

988156391 is an equidigital number, since it uses as much as digits as its factorization.

988156391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 50.

The square root of 988156391 is about 31434.9549228244. The cubic root of 988156391 is about 996.0364412913.

The spelling of 988156391 in words is "nine hundred eighty-eight million, one hundred fifty-six thousand, three hundred ninety-one".