1025720917 has 16 divisors (see below), whose sum is σ = 1130396400. Its totient is φ = 924940800.

The previous prime is 1025720881. The next prime is 1025720921. The reversal of 1025720917 is 7190275201.

It can be written as a sum of positive squares in 8 ways, for example, as 270240721 + 755480196 = 16439^2 + 27486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1025720917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1025720987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113817 + ... + 122497.

It is an arithmetic number, because the mean of its divisors is an integer number (70649775).

Almost surely, 2^1025720917 is an apocalyptic number.

It is an amenable number.

1025720917 is a deficient number, since it is larger than the sum of its proper divisors (104675483).

1025720917 is a wasteful number, since it uses less digits than its factorization.

1025720917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8904.

The product of its (nonzero) digits is 8820, while the sum is 34.

The square root of 1025720917 is about 32026.8780401712. The cubic root of 1025720917 is about 1008.5011644112.

The spelling of 1025720917 in words is "one billion, twenty-five million, seven hundred twenty thousand, nine hundred seventeen".