1025522991 has 8 divisors (see below), whose sum is σ = 1519293360. Its totient is φ = 683681976.

The previous prime is 1025522987. The next prime is 1025523019. The reversal of 1025522991 is 1992255201.

It is a happy number.

1025522991 is a `hidden beast` number, since 10 + 2 + 552 + 2 + 9 + 91 = 666.

It is not a de Polignac number, because 1025522991 - 2² = 1025522987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1025522941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18991140 + ... + 18991193.

It is an arithmetic number, because the mean of its divisors is an integer number (189911670).

Almost surely, 2^1025522991 is an apocalyptic number.

1025522991 is a deficient number, since it is larger than the sum of its proper divisors (493770369).

1025522991 is an equidigital number, since it uses as much as digits as its factorization.

1025522991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37982342 (or 37982336 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

The square root of 1025522991 is about 32023.7878927525. The cubic root of 1025522991 is about 1008.4362924957.

The spelling of 1025522991 in words is "one billion, twenty-five million, five hundred twenty-two thousand, nine hundred ninety-one".