1187145761 has 8 divisors (see below), whose sum is σ = 1199602560. Its totient is φ = 1174707072.

The previous prime is 1187145727. The next prime is 1187145767. The reversal of 1187145761 is 1675417811.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1187145761 - 2³⁰ = 113403937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1187145767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156881 + ... + 164273.

It is an arithmetic number, because the mean of its divisors is an integer number (149950320).

Almost surely, 2^1187145761 is an apocalyptic number.

It is an amenable number.

1187145761 is a deficient number, since it is larger than the sum of its proper divisors (12456799).

1187145761 is a wasteful number, since it uses less digits than its factorization.

1187145761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9055.

The product of its digits is 47040, while the sum is 41.

The square root of 1187145761 is about 34454.9816572292. The cubic root of 1187145761 is about 1058.8505877734.

The spelling of 1187145761 in words is "one billion, one hundred eighty-seven million, one hundred forty-five thousand, seven hundred sixty-one".