1155520551 has 16 divisors (see below), whose sum is σ = 1558366208. Its totient is φ = 761529600.

The previous prime is 1155520547. The next prime is 1155520571. The reversal of 1155520551 is 1550255511.

It is not a de Polignac number, because 1155520551 - 2² = 1155520547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155520501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 339066 + ... + 342456.

It is an arithmetic number, because the mean of its divisors is an integer number (97397888).

Almost surely, 2^1155520551 is an apocalyptic number.

1155520551 is a deficient number, since it is larger than the sum of its proper divisors (402845657).

1155520551 is a wasteful number, since it uses less digits than its factorization.

1155520551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4662.

The product of its (nonzero) digits is 6250, while the sum is 30.

The square root of 1155520551 is about 33992.9485481916. The cubic root of 1155520551 is about 1049.3633482942.

The spelling of 1155520551 in words is "one billion, one hundred fifty-five million, five hundred twenty thousand, five hundred fifty-one".