1187988822601 has 9 divisors (see below), whose sum is σ = 1381955056749. Its totient is φ = 1018269593964.

The previous prime is 1187988822589. The next prime is 1187988822611. The reversal of 1187988822601 is 1062288897811.

The square root of 1187988822601 is 1089949.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1187988822601 - 2⁷ = 1187988822473 is a prime.

It is a super-2 number, since 2×1187988822601² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1187988822601.

It is not an unprimeable number, because it can be changed into a prime (1187988822611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7551790 + ... + 7707496.

It is an arithmetic number, because the mean of its divisors is an integer number (153550561861).

Almost surely, 2^{1187988822601} is an apocalyptic number.

1187988822601 is the 1089949-th square number.

1187988822601 is the 544975-th centered octagonal number.

It is an amenable number.

1187988822601 is a deficient number, since it is larger than the sum of its proper divisors (193966234148).

1187988822601 is an frugal number, since it uses more digits than its factorization.

1187988822601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311428 (or 155714 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 61.

The spelling of 1187988822601 in words is "one trillion, one hundred eighty-seven billion, nine hundred eighty-eight million, eight hundred twenty-two thousand, six hundred one".