1025558101 has 2 divisors, whose sum is σ = 1025558102. Its totient is φ = 1025558100.

The previous prime is 1025558087. The next prime is 1025558111. The reversal of 1025558101 is 1018555201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 615536100 + 410022001 = 24810^2 + 20249^2 .

It is an emirp because it is prime and its reverse (1018555201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1025558101 - 2¹¹ = 1025556053 is a prime.

It is a super-3 number, since 3×1025558101³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1025558101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1025558111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512779050 + 512779051.

It is an arithmetic number, because the mean of its divisors is an integer number (512779051).

Almost surely, 2^1025558101 is an apocalyptic number.

It is an amenable number.

1025558101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1025558101 is an equidigital number, since it uses as much as digits as its factorization.

1025558101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2000, while the sum is 28.

The square root of 1025558101 is about 32024.3360743045. The cubic root of 1025558101 is about 1008.4478007032.

The spelling of 1025558101 in words is "one billion, twenty-five million, five hundred fifty-eight thousand, one hundred one".