1613623921 has 16 divisors (see below), whose sum is σ = 2034442368. Its totient is φ = 1245571200.

The previous prime is 1613623883. The next prime is 1613623931. The reversal of 1613623921 is 1293263161.

It is a cyclic number.

It is not a de Polignac number, because 1613623921 - 2⁹ = 1613623409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1613623931) 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, 212515 + ... + 219976.

It is an arithmetic number, because the mean of its divisors is an integer number (127152648).

Almost surely, 2^1613623921 is an apocalyptic number.

It is an amenable number.

1613623921 is a deficient number, since it is larger than the sum of its proper divisors (420818447).

1613623921 is a wasteful number, since it uses less digits than its factorization.

1613623921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432552.

The product of its digits is 11664, while the sum is 34.

The square root of 1613623921 is about 40169.9380258422. The cubic root of 1613623921 is about 1172.9174327576.

The spelling of 1613623921 in words is "one billion, six hundred thirteen million, six hundred twenty-three thousand, nine hundred twenty-one".