1620532243 has 8 divisors (see below), whose sum is σ = 1771459776. Its totient is φ = 1470205800.

The previous prime is 1620532241. The next prime is 1620532247. The reversal of 1620532243 is 3422350261.

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 1620532243 - 2¹ = 1620532241 is a prime.

It is a super-2 number, since 2×1620532243² = 5252249501205222098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620532241) 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, 144621 + ... + 155422.

It is an arithmetic number, because the mean of its divisors is an integer number (221432472).

Almost surely, 2^1620532243 is an apocalyptic number.

1620532243 is a deficient number, since it is larger than the sum of its proper divisors (150927533).

1620532243 is a wasteful number, since it uses less digits than its factorization.

1620532243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300545.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 1620532243 is about 40255.8348938387. The cubic root of 1620532243 is about 1174.5888993104.

The spelling of 1620532243 in words is "one billion, six hundred twenty million, five hundred thirty-two thousand, two hundred forty-three".