1151220225 has 24 divisors (see below), whose sum is σ = 1915974592. Its totient is φ = 609912000.

The previous prime is 1151220223. The next prime is 1151220227. The reversal of 1151220225 is 5220221511.

It is an interprime number because it is at equal distance from previous prime (1151220223) and next prime (1151220227).

It is not a de Polignac number, because 1151220225 - 2¹ = 1151220223 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1151220223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39502 + ... + 62151.

Almost surely, 2^1151220225 is an apocalyptic number.

1151220225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1151220225 is a deficient number, since it is larger than the sum of its proper divisors (764754367).

1151220225 is a wasteful number, since it uses less digits than its factorization.

1151220225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101817 (or 101812 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 1151220225 is about 33929.6363817828. The cubic root of 1151220225 is about 1048.0599778354.

Adding to 1151220225 its reverse (5220221511), we get a palindrome (6371441736).

The spelling of 1151220225 in words is "one billion, one hundred fifty-one million, two hundred twenty thousand, two hundred twenty-five".