257072981 has 8 divisors (see below), whose sum is σ = 280569504. Its totient is φ = 233597520.

The previous prime is 257072969. The next prime is 257072999. The reversal of 257072981 is 189270752.

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

It is a cyclic number.

It is not a de Polignac number, because 257072981 - 2⁶ = 257072917 is a prime.

It is a super-2 number, since 2×257072981² = 132173035120452722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257072951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31391 + ... + 38723.

It is an arithmetic number, because the mean of its divisors is an integer number (35071188).

Almost surely, 2^257072981 is an apocalyptic number.

It is an amenable number.

257072981 is a deficient number, since it is larger than the sum of its proper divisors (23496523).

257072981 is a wasteful number, since it uses less digits than its factorization.

257072981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10531.

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 257072981 is about 16033.4955951595. The cubic root of 257072981 is about 635.8462942578.

The spelling of 257072981 in words is "two hundred fifty-seven million, seventy-two thousand, nine hundred eighty-one".