1671021057 has 4 divisors (see below), whose sum is σ = 2228028080. Its totient is φ = 1114014036.

The previous prime is 1671021031. The next prime is 1671021067. The reversal of 1671021057 is 7501201761.

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 not a de Polignac number, because 1671021057 - 2¹⁹ = 1670496769 is a prime.

It is a super-3 number, since 3×1671021057³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1671021017) 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, 278503507 + ... + 278503512.

It is an arithmetic number, because the mean of its divisors is an integer number (557007020).

Almost surely, 2^1671021057 is an apocalyptic number.

It is an amenable number.

1671021057 is a deficient number, since it is larger than the sum of its proper divisors (557007023).

1671021057 is an equidigital number, since it uses as much as digits as its factorization.

1671021057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557007022.

The product of its (nonzero) digits is 2940, while the sum is 30.

The square root of 1671021057 is about 40878.1244310450. The cubic root of 1671021057 is about 1186.6627437045.

The spelling of 1671021057 in words is "one billion, six hundred seventy-one million, twenty-one thousand, fifty-seven".