999571457 has 8 divisors (see below), whose sum is σ = 1059247656. Its totient is φ = 939992832.

The previous prime is 999571427. The next prime is 999571477. The reversal of 999571457 is 754175999.

It is a Cunningham number, because it is equal to 31616²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 754930576 + 244640881 = 27476^2 + 15641^2 .

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

It is not a de Polignac number, because 999571457 - 2⁶ = 999571393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999571427) 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, 2738 + ... + 44795.

It is an arithmetic number, because the mean of its divisors is an integer number (132405957).

Almost surely, 2^999571457 is an apocalyptic number.

It is an amenable number.

999571457 is a deficient number, since it is larger than the sum of its proper divisors (59676199).

999571457 is a wasteful number, since it uses less digits than its factorization.

999571457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48787.

The product of its digits is 3572100, while the sum is 56.

The square root of 999571457 is about 31616.0000158148. Note that the first 4 decimals coincide. The cubic root of 999571457 is about 999.8571319230.

The spelling of 999571457 in words is "nine hundred ninety-nine million, five hundred seventy-one thousand, four hundred fifty-seven".