1025391001 has 4 divisors (see below), whose sum is σ = 1025829504. Its totient is φ = 1024952500.

The previous prime is 1025390987. The next prime is 1025391011. The reversal of 1025391001 is 1001935201.

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 a cyclic number.

It is not a de Polignac number, because 1025391001 - 2⁹ = 1025390489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1025391011) 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 3 ways as a sum of consecutive naturals, for example, 215725 + ... + 220426.

It is an arithmetic number, because the mean of its divisors is an integer number (256457376).

Almost surely, 2^1025391001 is an apocalyptic number.

It is an amenable number.

1025391001 is a deficient number, since it is larger than the sum of its proper divisors (438503).

1025391001 is an equidigital number, since it uses as much as digits as its factorization.

1025391001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438502.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 1025391001 is about 32021.7270146380. The cubic root of 1025391001 is about 1008.3930270210.

The spelling of 1025391001 in words is "one billion, twenty-five million, three hundred ninety-one thousand, one".