1621768141 has 16 divisors (see below), whose sum is σ = 1893472000. Its totient is φ = 1388472624.

The previous prime is 1621768133. The next prime is 1621768151. The reversal of 1621768141 is 1418671261.

It is not a de Polignac number, because 1621768141 - 2³ = 1621768133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1621768141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621768121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 364456 + ... + 368878.

It is an arithmetic number, because the mean of its divisors is an integer number (118342000).

Almost surely, 2^1621768141 is an apocalyptic number.

It is an amenable number.

1621768141 is a deficient number, since it is larger than the sum of its proper divisors (271703859).

1621768141 is an equidigital number, since it uses as much as digits as its factorization.

1621768141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5513 (or 5499 counting only the distinct ones).

The product of its digits is 16128, while the sum is 37.

The square root of 1621768141 is about 40271.1825130576. The cubic root of 1621768141 is about 1174.8874232871.

The spelling of 1621768141 in words is "one billion, six hundred twenty-one million, seven hundred sixty-eight thousand, one hundred forty-one".