1601621213 has 8 divisors (see below), whose sum is σ = 1622520960. Its totient is φ = 1580857200.

The previous prime is 1601621201. The next prime is 1601621227. The reversal of 1601621213 is 3121261061.

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 1601621213 - 2¹⁶ = 1601555677 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 (1601621233) 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, 10073 + ... + 57486.

It is an arithmetic number, because the mean of its divisors is an integer number (202815120).

Almost surely, 2^1601621213 is an apocalyptic number.

It is an amenable number.

1601621213 is a deficient number, since it is larger than the sum of its proper divisors (20899747).

1601621213 is a wasteful number, since it uses less digits than its factorization.

1601621213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67867.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1601621213 is about 40020.2600316390. The cubic root of 1601621213 is about 1170.0019998992.

Adding to 1601621213 its reverse (3121261061), we get a palindrome (4722882274).

The spelling of 1601621213 in words is "one billion, six hundred one million, six hundred twenty-one thousand, two hundred thirteen".