1187145351844 has 9 divisors (see below), whose sum is σ = 2077508179201. Its totient is φ = 593571586360.

The previous prime is 1187145351841. The next prime is 1187145351869. The reversal of 1187145351844 is 4481535417811.

The square root of 1187145351844 is 1089562.

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

It can be written as a sum of positive squares in only one way, i.e., 1085843193444 + 101302158400 = 1042038^2 + 318280^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1187145351791 and 1187145351800.

It is not an unprimeable number, because it can be changed into a prime (1187145351841) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1906734 + ... + 2451514.

Almost surely, 2^{1187145351844} is an apocalyptic number.

1187145351844 is the 1089562-nd square number.

It is an amenable number.

1187145351844 is a deficient number, since it is larger than the sum of its proper divisors (890362827357).

1187145351844 is an frugal number, since it uses more digits than its factorization.

1187145351844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089566 (or 544783 counting only the distinct ones).

The product of its digits is 2150400, while the sum is 52.

The spelling of 1187145351844 in words is "one trillion, one hundred eighty-seven billion, one hundred forty-five million, three hundred fifty-one thousand, eight hundred forty-four".