1025700257 has 4 divisors (see below), whose sum is σ = 1025777796. Its totient is φ = 1025622720.

The previous prime is 1025700229. The next prime is 1025700259. The reversal of 1025700257 is 7520075201.

1025700257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 366186496 + 659513761 = 19136^2 + 25681^2 .

It is a cyclic number.

It is not a de Polignac number, because 1025700257 - 2²⁸ = 757264801 is a prime.

It is a super-2 number, since 2×1025700257² = 2104122034419732098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1025700259) 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, 13388 + ... + 47229.

It is an arithmetic number, because the mean of its divisors is an integer number (256444449).

Almost surely, 2^1025700257 is an apocalyptic number.

It is an amenable number.

1025700257 is a deficient number, since it is larger than the sum of its proper divisors (77539).

1025700257 is an equidigital number, since it uses as much as digits as its factorization.

1025700257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77538.

The product of its (nonzero) digits is 4900, while the sum is 29.

The square root of 1025700257 is about 32026.5554969622. Note that the first 3 decimals coincide. The cubic root of 1025700257 is about 1008.4943933121.

Adding to 1025700257 its reverse (7520075201), we get a palindrome (8545775458).

The spelling of 1025700257 in words is "one billion, twenty-five million, seven hundred thousand, two hundred fifty-seven".