1191215025 has 384 divisors, whose sum is σ = 3079802880. Its totient is φ = 435456000.

The previous prime is 1191215023. The next prime is 1191215093. The reversal of 1191215025 is 5205121911.

It is not a de Polignac number, because 1191215025 - 2¹ = 1191215023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1191215025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191215023) by changing a digit.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 27702654 + ... + 27702696.

It is an arithmetic number, because the mean of its divisors is an integer number (8020320).

Almost surely, 2^1191215025 is an apocalyptic number.

1191215025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1191215025 is an abundant number, since it is smaller than the sum of its proper divisors (1888587855).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1191215025 is a wasteful number, since it uses less digits than its factorization.

1191215025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 27.

The square root of 1191215025 is about 34513.9830358653. The cubic root of 1191215025 is about 1060.0590405586.

Adding to 1191215025 its reverse (5205121911), we get a palindrome (6396336936).

The spelling of 1191215025 in words is "one billion, one hundred ninety-one million, two hundred fifteen thousand, twenty-five".