1601246721 has 8 divisors (see below), whose sum is σ = 2138228224. Its totient is φ = 1065881520.

The previous prime is 1601246701. The next prime is 1601246737. The reversal of 1601246721 is 1276421061.

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

It is not a de Polignac number, because 1601246721 - 2¹⁸ = 1600984577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1601246701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 401761 + ... + 405726.

It is an arithmetic number, because the mean of its divisors is an integer number (267278528).

Almost surely, 2^1601246721 is an apocalyptic number.

It is an amenable number.

1601246721 is a deficient number, since it is larger than the sum of its proper divisors (536981503).

1601246721 is an equidigital number, since it uses as much as digits as its factorization.

1601246721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808151.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 1601246721 is about 40015.5809779141. The cubic root of 1601246721 is about 1169.9108026090.

Adding to 1601246721 its reverse (1276421061), we get a palindrome (2877667782).

The spelling of 1601246721 in words is "one billion, six hundred one million, two hundred forty-six thousand, seven hundred twenty-one".