1187551 has 2 divisors, whose sum is σ = 1187552. Its totient is φ = 1187550.

The previous prime is 1187539. The next prime is 1187561. The reversal of 1187551 is 1557811.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1187551 - 2¹⁷ = 1056479 is a prime.

It is a Chen prime.

1187551 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1187561) 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, 593775 + 593776.

It is an arithmetic number, because the mean of its divisors is an integer number (593776).

2^1187551 is an apocalyptic number.

1187551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1187551 is an equidigital number, since it uses as much as digits as its factorization.

1187551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1400, while the sum is 28.

The square root of 1187551 is about 1089.7481360388. The cubic root of 1187551 is about 105.8971055636.

The spelling of 1187551 in words is "one million, one hundred eighty-seven thousand, five hundred fifty-one".