1621069013 has 4 divisors (see below), whose sum is σ = 1632731520. Its totient is φ = 1609406508.

The previous prime is 1621069007. The next prime is 1621069061. The reversal of 1621069013 is 3109601261.

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 1621069013 - 2¹⁶ = 1621003477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621069213) 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, 5831045 + ... + 5831322.

It is an arithmetic number, because the mean of its divisors is an integer number (408182880).

Almost surely, 2^1621069013 is an apocalyptic number.

It is an amenable number.

1621069013 is a deficient number, since it is larger than the sum of its proper divisors (11662507).

1621069013 is a wasteful number, since it uses less digits than its factorization.

1621069013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11662506.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 1621069013 is about 40262.5013256752. The cubic root of 1621069013 is about 1174.7185716217.

The spelling of 1621069013 in words is "one billion, six hundred twenty-one million, sixty-nine thousand, thirteen".