1187581379 has 16 divisors (see below), whose sum is σ = 1266269760. Its totient is φ = 1111418880.

The previous prime is 1187581361. The next prime is 1187581391. The reversal of 1187581379 is 9731857811.

It is not a de Polignac number, because 1187581379 - 2¹⁶ = 1187515843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1187581079) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195569 + ... + 201549.

It is an arithmetic number, because the mean of its divisors is an integer number (79141860).

Almost surely, 2^1187581379 is an apocalyptic number.

1187581379 is a deficient number, since it is larger than the sum of its proper divisors (78688381).

1187581379 is an equidigital number, since it uses as much as digits as its factorization.

1187581379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6190.

The product of its digits is 423360, while the sum is 50.

The square root of 1187581379 is about 34461.3026306319. The cubic root of 1187581379 is about 1058.9800854822.

The spelling of 1187581379 in words is "one billion, one hundred eighty-seven million, five hundred eighty-one thousand, three hundred seventy-nine".