1191378051 has 20 divisors (see below), whose sum is σ = 1781507200. Its totient is φ = 793451376.

The previous prime is 1191378017. The next prime is 1191378079. The reversal of 1191378051 is 1508731911.

It is not a de Polignac number, because 1191378051 - 2¹¹ = 1191376003 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1191377997 and 1191378015.

It is not an unprimeable number, because it can be changed into a prime (1191378011) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 79710 + ... + 93468.

It is an arithmetic number, because the mean of its divisors is an integer number (89075360).

Almost surely, 2^1191378051 is an apocalyptic number.

1191378051 is a deficient number, since it is larger than the sum of its proper divisors (590129149).

1191378051 is a wasteful number, since it uses less digits than its factorization.

1191378051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14840 (or 14831 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 36.

The square root of 1191378051 is about 34516.3446934927. The cubic root of 1191378051 is about 1060.1073971521.

The spelling of 1191378051 in words is "one billion, one hundred ninety-one million, three hundred seventy-eight thousand, fifty-one".