1621628713 has 4 divisors (see below), whose sum is σ = 1632368128. Its totient is φ = 1610889300.

The previous prime is 1621628707. The next prime is 1621628737. The reversal of 1621628713 is 3178261261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1621628713 - 2⁵ = 1621628681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1621628783) 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, 5369481 + ... + 5369782.

It is an arithmetic number, because the mean of its divisors is an integer number (408092032).

Almost surely, 2^1621628713 is an apocalyptic number.

It is an amenable number.

1621628713 is a deficient number, since it is larger than the sum of its proper divisors (10739415).

1621628713 is a wasteful number, since it uses less digits than its factorization.

1621628713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10739414.

The product of its digits is 24192, while the sum is 37.

The square root of 1621628713 is about 40269.4513620437. The cubic root of 1621628713 is about 1174.8537528558.

Adding to 1621628713 its reverse (3178261261), we get a palindrome (4799889974).

The spelling of 1621628713 in words is "one billion, six hundred twenty-one million, six hundred twenty-eight thousand, seven hundred thirteen".