1189631 has 2 divisors, whose sum is σ = 1189632. Its totient is φ = 1189630.

The previous prime is 1189627. The next prime is 1189633. The reversal of 1189631 is 1369811.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1189631 - 2² = 1189627 is a prime.

It is a super-2 number, since 2×1189631² = 2830443832322, which contains 22 as substring.

Together with 1189633, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 1189594 and 1189603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1189633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 594815 + 594816.

It is an arithmetic number, because the mean of its divisors is an integer number (594816).

2^1189631 is an apocalyptic number.

1189631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1189631 is an equidigital number, since it uses as much as digits as its factorization.

1189631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 29.

The square root of 1189631 is about 1090.7020674776. The cubic root of 1189631 is about 105.9588958940.

The spelling of 1189631 in words is "one million, one hundred eighty-nine thousand, six hundred thirty-one".