1620542145 has 8 divisors (see below), whose sum is σ = 2592867456. Its totient is φ = 864289136.

The previous prime is 1620542137. The next prime is 1620542149. The reversal of 1620542145 is 5412450261.

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 1620542145 - 2³ = 1620542137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1620542149) 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, 54018057 + ... + 54018086.

It is an arithmetic number, because the mean of its divisors is an integer number (324108432).

Almost surely, 2^1620542145 is an apocalyptic number.

1620542145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1620542145 is a deficient number, since it is larger than the sum of its proper divisors (972325311).

1620542145 is a wasteful number, since it uses less digits than its factorization.

1620542145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108036151.

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 1620542145 is about 40255.9578820328. The cubic root of 1620542145 is about 1174.5912916840.

The spelling of 1620542145 in words is "one billion, six hundred twenty million, five hundred forty-two thousand, one hundred forty-five".