257017045 has 8 divisors (see below), whose sum is σ = 308564280. Its totient is φ = 205517760.

The previous prime is 257017021. The next prime is 257017051. The reversal of 257017045 is 540710752.

It can be written as a sum of positive squares in 4 ways, for example, as 1240996 + 255776049 = 1114^2 + 15993^2 .

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

It is not a de Polignac number, because 257017045 - 2⁷ = 257016917 is a prime.

It is a super-2 number, since 2×257017045² = 132115522841064050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 257016998 and 257017016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1111 + ... + 22699.

It is an arithmetic number, because the mean of its divisors is an integer number (38570535).

Almost surely, 2^257017045 is an apocalyptic number.

It is an amenable number.

257017045 is a deficient number, since it is larger than the sum of its proper divisors (51547235).

257017045 is a wasteful number, since it uses less digits than its factorization.

257017045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23975.

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 257017045 is about 16031.7511520108. The cubic root of 257017045 is about 635.8001734012.

Adding to 257017045 its reverse (540710752), we get a palindrome (797727797).

The spelling of 257017045 in words is "two hundred fifty-seven million, seventeen thousand, forty-five".