1025431257 has 4 divisors (see below), whose sum is σ = 1367241680. Its totient is φ = 683620836.

The previous prime is 1025431247. The next prime is 1025431259. The reversal of 1025431257 is 7521345201.

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 1025431257 - 2⁶ = 1025431193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1025431259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170905207 + ... + 170905212.

It is an arithmetic number, because the mean of its divisors is an integer number (341810420).

Almost surely, 2^1025431257 is an apocalyptic number.

It is an amenable number.

1025431257 is a deficient number, since it is larger than the sum of its proper divisors (341810423).

1025431257 is an equidigital number, since it uses as much as digits as its factorization.

1025431257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341810422.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 1025431257 is about 32022.3555816870. The cubic root of 1025431257 is about 1008.4062230729.

Adding to 1025431257 its reverse (7521345201), we get a palindrome (8546776458).

The spelling of 1025431257 in words is "one billion, twenty-five million, four hundred thirty-one thousand, two hundred fifty-seven".