1025778117 has 24 divisors (see below), whose sum is σ = 1692583104. Its totient is φ = 541067904.

The previous prime is 1025778101. The next prime is 1025778167. The reversal of 1025778117 is 7118775201.

It is not a de Polignac number, because 1025778117 - 2⁴ = 1025778101 is a prime.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1025778167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 140968 + ... + 148065.

It is an arithmetic number, because the mean of its divisors is an integer number (70524296).

Almost surely, 2^1025778117 is an apocalyptic number.

It is an amenable number.

1025778117 is a deficient number, since it is larger than the sum of its proper divisors (666804987).

1025778117 is a wasteful number, since it uses less digits than its factorization.

1025778117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289069 (or 289056 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 39.

The square root of 1025778117 is about 32027.7710276566. The cubic root of 1025778117 is about 1008.5199106391.

The spelling of 1025778117 in words is "one billion, twenty-five million, seven hundred seventy-eight thousand, one hundred seventeen".