1642723361 has 4 divisors (see below), whose sum is σ = 1653748500. Its totient is φ = 1631698224.

The previous prime is 1642723339. The next prime is 1642723427. The reversal of 1642723361 is 1633272461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1031694400 + 611028961 = 32120^2 + 24719^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642723361 - 2²⁶ = 1575614497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1642723561) 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, 5512346 + ... + 5512643.

It is an arithmetic number, because the mean of its divisors is an integer number (413437125).

Almost surely, 2^1642723361 is an apocalyptic number.

It is an amenable number.

1642723361 is a deficient number, since it is larger than the sum of its proper divisors (11025139).

1642723361 is a wasteful number, since it uses less digits than its factorization.

1642723361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11025138.

The product of its digits is 36288, while the sum is 35.

The square root of 1642723361 is about 40530.5238184754. The cubic root of 1642723361 is about 1179.9261087983.

The spelling of 1642723361 in words is "one billion, six hundred forty-two million, seven hundred twenty-three thousand, three hundred sixty-one".