1641797421 has 8 divisors (see below), whose sum is σ = 2388069024. Its totient is φ = 995028720.

The previous prime is 1641797419. The next prime is 1641797461. The reversal of 1641797421 is 1247971461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1641797421 - 2¹ = 1641797419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641797461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24875686 + ... + 24875751.

It is an arithmetic number, because the mean of its divisors is an integer number (298508628).

Almost surely, 2^1641797421 is an apocalyptic number.

1641797421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1641797421 is a deficient number, since it is larger than the sum of its proper divisors (746271603).

1641797421 is a wasteful number, since it uses less digits than its factorization.

1641797421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49751451.

The product of its digits is 84672, while the sum is 42.

The square root of 1641797421 is about 40519.0994593908. The cubic root of 1641797421 is about 1179.7043741379.

The spelling of 1641797421 in words is "one billion, six hundred forty-one million, seven hundred ninety-seven thousand, four hundred twenty-one".