1151212251 has 16 divisors (see below), whose sum is σ = 1770626304. Its totient is φ = 651686304.

The previous prime is 1151212243. The next prime is 1151212267. The reversal of 1151212251 is 1522121511.

It is not a de Polignac number, because 1151212251 - 2³ = 1151212243 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1151217251) 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, 253920 + ... + 258413.

It is an arithmetic number, because the mean of its divisors is an integer number (110664144).

Almost surely, 2^1151212251 is an apocalyptic number.

1151212251 is a deficient number, since it is larger than the sum of its proper divisors (619414053).

1151212251 is a wasteful number, since it uses less digits than its factorization.

1151212251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512450.

The product of its digits is 200, while the sum is 21.

The square root of 1151212251 is about 33929.5188736887. The cubic root of 1151212251 is about 1048.0575580119.

Adding to 1151212251 its reverse (1522121511), we get a palindrome (2673333762).

The spelling of 1151212251 in words is "one billion, one hundred fifty-one million, two hundred twelve thousand, two hundred fifty-one".