1155020621 has 8 divisors (see below), whose sum is σ = 1218528000. Its totient is φ = 1091784960.

The previous prime is 1155020611. The next prime is 1155020627. The reversal of 1155020621 is 1260205511.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1155020621 - 2¹⁸ = 1154758477 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 (1155020627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59165 + ... + 76226.

It is an arithmetic number, because the mean of its divisors is an integer number (152316000).

Almost surely, 2^1155020621 is an apocalyptic number.

It is an amenable number.

1155020621 is a deficient number, since it is larger than the sum of its proper divisors (63507379).

1155020621 is a wasteful number, since it uses less digits than its factorization.

1155020621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135859.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 1155020621 is about 33985.5943158274. The cubic root of 1155020621 is about 1049.2119925862.

The spelling of 1155020621 in words is "one billion, one hundred fifty-five million, twenty thousand, six hundred twenty-one".