1025618879 has 4 divisors (see below), whose sum is σ = 1079598840. Its totient is φ = 971638920.

The previous prime is 1025618831. The next prime is 1025618887. The reversal of 1025618879 is 9788165201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1025618879 is a prime.

It is a super-2 number, since 2×1025618879² = 2103788169922433282, 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 (1025618899) 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, 26989952 + ... + 26989989.

It is an arithmetic number, because the mean of its divisors is an integer number (269899710).

Almost surely, 2^1025618879 is an apocalyptic number.

1025618879 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1025618879 is a deficient number, since it is larger than the sum of its proper divisors (53979961).

1025618879 is an equidigital number, since it uses as much as digits as its factorization.

1025618879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53979960.

The product of its (nonzero) digits is 241920, while the sum is 47.

The square root of 1025618879 is about 32025.2849948287. The cubic root of 1025618879 is about 1008.4677216385.

The spelling of 1025618879 in words is "one billion, twenty-five million, six hundred eighteen thousand, eight hundred seventy-nine".