1621506316 has 12 divisors (see below), whose sum is σ = 2842425432. Its totient is φ = 809384768.

The previous prime is 1621506311. The next prime is 1621506317. The reversal of 1621506316 is 6136051261.

It is not an unprimeable number, because it can be changed into a prime (1621506311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 339430 + ... + 344173.

It is an arithmetic number, because the mean of its divisors is an integer number (236868786).

Almost surely, 2^1621506316 is an apocalyptic number.

It is an amenable number.

1621506316 is a deficient number, since it is larger than the sum of its proper divisors (1220919116).

1621506316 is a wasteful number, since it uses less digits than its factorization.

1621506316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684200 (or 684198 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1621506316 is about 40267.9316081668. The cubic root of 1621506316 is about 1174.8241936454.

Adding to 1621506316 its reverse (6136051261), we get a palindrome (7757557577).

The spelling of 1621506316 in words is "one billion, six hundred twenty-one million, five hundred six thousand, three hundred sixteen".