1355240621 has 8 divisors (see below), whose sum is σ = 1555671360. Its totient is φ = 1156516128.

The previous prime is 1355240617. The next prime is 1355240633. The reversal of 1355240621 is 1260425531.

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 1355240621 - 2² = 1355240617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355240611) 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, 424856 + ... + 428033.

It is an arithmetic number, because the mean of its divisors is an integer number (194458920).

Almost surely, 2^1355240621 is an apocalyptic number.

It is an amenable number.

1355240621 is a deficient number, since it is larger than the sum of its proper divisors (200430739).

1355240621 is an equidigital number, since it uses as much as digits as its factorization.

1355240621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853123.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 1355240621 is about 36813.5928836075. The cubic root of 1355240621 is about 1106.6377224954.

The spelling of 1355240621 in words is "one billion, three hundred fifty-five million, two hundred forty thousand, six hundred twenty-one".