1721472057 has 24 divisors (see below), whose sum is σ = 2523876264. Its totient is φ = 1130471424.

The previous prime is 1721472047. The next prime is 1721472083. The reversal of 1721472057 is 7502741271.

It can be written as a sum of positive squares in 4 ways, for example, as 13220496 + 1708251561 = 3636^2 + 41331^2 .

It is not a de Polignac number, because 1721472057 - 2¹⁶ = 1721406521 is a prime.

It is a super-2 number, since 2×1721472057² = 5926932086063622498, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1721472017) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 798493 + ... + 800645.

It is an arithmetic number, because the mean of its divisors is an integer number (105161511).

Almost surely, 2^1721472057 is an apocalyptic number.

It is an amenable number.

1721472057 is a deficient number, since it is larger than the sum of its proper divisors (802404207).

1721472057 is a wasteful number, since it uses less digits than its factorization.

1721472057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3449 (or 3446 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 36.

The square root of 1721472057 is about 41490.6261341041. The cubic root of 1721472057 is about 1198.4869952322.

The spelling of 1721472057 in words is "one billion, seven hundred twenty-one million, four hundred seventy-two thousand, fifty-seven".