1641211601 has 4 divisors (see below), whose sum is σ = 1652080704. Its totient is φ = 1630342500.

The previous prime is 1641211577. The next prime is 1641211609. The reversal of 1641211601 is 1061121461.

It is a happy number.

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 1641211601 - 2²² = 1637017297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1641211609) 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, 5434325 + ... + 5434626.

It is an arithmetic number, because the mean of its divisors is an integer number (413020176).

Almost surely, 2^1641211601 is an apocalyptic number.

It is an amenable number.

1641211601 is a deficient number, since it is larger than the sum of its proper divisors (10869103).

1641211601 is a wasteful number, since it uses less digits than its factorization.

1641211601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10869102.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 1641211601 is about 40511.8698778518. The cubic root of 1641211601 is about 1179.5640448821.

The spelling of 1641211601 in words is "one billion, six hundred forty-one million, two hundred eleven thousand, six hundred one".