1022512661 has 4 divisors (see below), whose sum is σ = 1037774112. Its totient is φ = 1007251212.

The previous prime is 1022512597. The next prime is 1022512693. The reversal of 1022512661 is 1662152201.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1662152201 = 23 ⋅72267487.

It is a cyclic number.

It is not a de Polignac number, because 1022512661 - 2⁶ = 1022512597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1022512661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1022512061) 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, 7630625 + ... + 7630758.

It is an arithmetic number, because the mean of its divisors is an integer number (259443528).

Almost surely, 2^1022512661 is an apocalyptic number.

It is an amenable number.

1022512661 is a deficient number, since it is larger than the sum of its proper divisors (15261451).

1022512661 is an equidigital number, since it uses as much as digits as its factorization.

1022512661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15261450.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 1022512661 is about 31976.7518832041. The cubic root of 1022512661 is about 1007.4486009240.

Adding to 1022512661 its reverse (1662152201), we get a palindrome (2684664862).

The spelling of 1022512661 in words is "one billion, twenty-two million, five hundred twelve thousand, six hundred sixty-one".