1145225551 has 4 divisors (see below), whose sum is σ = 1205500600. Its totient is φ = 1084950504.

The previous prime is 1145225539. The next prime is 1145225611. The reversal of 1145225551 is 1555225411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1555225411 = 19 ⋅81853969.

It is a cyclic number.

It is not a de Polignac number, because 1145225551 - 2¹¹ = 1145223503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1145225251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30137496 + ... + 30137533.

It is an arithmetic number, because the mean of its divisors is an integer number (301375150).

Almost surely, 2^1145225551 is an apocalyptic number.

1145225551 is a deficient number, since it is larger than the sum of its proper divisors (60275049).

1145225551 is an equidigital number, since it uses as much as digits as its factorization.

1145225551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60275048.

The product of its digits is 10000, while the sum is 31.

The square root of 1145225551 is about 33841.1812884834. The cubic root of 1145225551 is about 1046.2376462720.

The spelling of 1145225551 in words is "one billion, one hundred forty-five million, two hundred twenty-five thousand, five hundred fifty-one".