1025091869 has 2 divisors, whose sum is σ = 1025091870. Its totient is φ = 1025091868.

The previous prime is 1025091827. The next prime is 1025091883. The reversal of 1025091869 is 9681905201.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 716632900 + 308458969 = 26770^2 + 17563^2 .

It is a cyclic number.

It is not a de Polignac number, because 1025091869 - 2¹² = 1025087773 is a prime.

It is a super-2 number, since 2×1025091869² = 2101626679779826322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1025091889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512545934 + 512545935.

It is an arithmetic number, because the mean of its divisors is an integer number (512545935).

Almost surely, 2^1025091869 is an apocalyptic number.

It is an amenable number.

1025091869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1025091869 is an equidigital number, since it uses as much as digits as its factorization.

1025091869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 1025091869 is about 32017.0559077502. The cubic root of 1025091869 is about 1008.2949597278.

The spelling of 1025091869 in words is "one billion, twenty-five million, ninety-one thousand, eight hundred sixty-nine".