1025090561 has 4 divisors (see below), whose sum is σ = 1118280624. Its totient is φ = 931900500.

The previous prime is 1025090557. The next prime is 1025090597. The reversal of 1025090561 is 1650905201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1025090561 - 2² = 1025090557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1025090161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46595015 + ... + 46595036.

It is an arithmetic number, because the mean of its divisors is an integer number (279570156).

Almost surely, 2^1025090561 is an apocalyptic number.

1025090561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1025090561 is a deficient number, since it is larger than the sum of its proper divisors (93190063).

1025090561 is an equidigital number, since it uses as much as digits as its factorization.

1025090561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93190062.

The product of its (nonzero) digits is 2700, while the sum is 29.

The square root of 1025090561 is about 32017.0354811310. The cubic root of 1025090561 is about 1008.2945308718.

Adding to 1025090561 its reverse (1650905201), we get a palindrome (2675995762).

The spelling of 1025090561 in words is "one billion, twenty-five million, ninety thousand, five hundred sixty-one".