1721408901 has 4 divisors (see below), whose sum is σ = 2295211872. Its totient is φ = 1147605932.

The previous prime is 1721408813. The next prime is 1721408929. The reversal of 1721408901 is 1098041271.

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 1721408901 - 2¹⁵ = 1721376133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721407901) 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, 286901481 + ... + 286901486.

It is an arithmetic number, because the mean of its divisors is an integer number (573802968).

Almost surely, 2^1721408901 is an apocalyptic number.

It is an amenable number.

1721408901 is a deficient number, since it is larger than the sum of its proper divisors (573802971).

1721408901 is an equidigital number, since it uses as much as digits as its factorization.

1721408901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573802970.

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 1721408901 is about 41489.8650395491. The cubic root of 1721408901 is about 1198.4723386732.

The spelling of 1721408901 in words is "one billion, seven hundred twenty-one million, four hundred eight thousand, nine hundred one".