1061667521 has 4 divisors (see below), whose sum is σ = 1071407700. Its totient is φ = 1051927344.

The previous prime is 1061667487. The next prime is 1061667533. The reversal of 1061667521 is 1257661601.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 820020496 + 241647025 = 28636^2 + 15545^2 .

It is a cyclic number.

It is not a de Polignac number, because 1061667521 - 2⁶ = 1061667457 is a prime.

It is a super-2 number, since 2×1061667521² = 2254275850292570882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1061667121) 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, 4869926 + ... + 4870143.

It is an arithmetic number, because the mean of its divisors is an integer number (267851925).

Almost surely, 2^1061667521 is an apocalyptic number.

It is an amenable number.

1061667521 is a deficient number, since it is larger than the sum of its proper divisors (9740179).

1061667521 is an equidigital number, since it uses as much as digits as its factorization.

1061667521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9740178.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 1061667521 is about 32583.2398788089. The cubic root of 1061667521 is about 1020.1472045012.

The spelling of 1061667521 in words is "one billion, sixty-one million, six hundred sixty-seven thousand, five hundred twenty-one".