1639056001 has 4 divisors (see below), whose sum is σ = 1788061104. Its totient is φ = 1490050900.

The previous prime is 1639055989. The next prime is 1639056011. The reversal of 1639056001 is 1006509361.

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 1639056001 - 2¹⁷ = 1638924929 is a prime.

It is a super-3 number, since 3×1639056001³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1639056011) 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, 74502535 + ... + 74502556.

It is an arithmetic number, because the mean of its divisors is an integer number (447015276).

Almost surely, 2^1639056001 is an apocalyptic number.

1639056001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1639056001 is a deficient number, since it is larger than the sum of its proper divisors (149005103).

1639056001 is a wasteful number, since it uses less digits than its factorization.

1639056001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149005102.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 1639056001 is about 40485.2565880470. The cubic root of 1639056001 is about 1179.0473976556.

The spelling of 1639056001 in words is "one billion, six hundred thirty-nine million, fifty-six thousand, one".