1721270493 has 10 divisors (see below), whose sum is σ = 2571280734. Its totient is φ = 1147513608.

The previous prime is 1721270483. The next prime is 1721270513. The reversal of 1721270493 is 3940721271.

It can be written as a sum of positive squares in only one way, i.e., 1458246969 + 263023524 = 38187^2 + 16218^2 .

It is not a de Polignac number, because 1721270493 - 2⁵ = 1721270461 is a prime.

It is a super-2 number, since 2×1721270493² = 5925544220144926098, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721270423) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 10625046 + ... + 10625207.

Almost surely, 2^1721270493 is an apocalyptic number.

It is an amenable number.

1721270493 is a deficient number, since it is larger than the sum of its proper divisors (850010241).

1721270493 is an equidigital number, since it uses as much as digits as its factorization.

1721270493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21250265 (or 21250256 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 1721270493 is about 41488.1970324091. The cubic root of 1721270493 is about 1198.4402171931.

The spelling of 1721270493 in words is "one billion, seven hundred twenty-one million, two hundred seventy thousand, four hundred ninety-three".