1050991561 has 9 divisors (see below), whose sum is σ = 1117036999. Its totient is φ = 988649824.

The previous prime is 1050991511. The next prime is 1050991573. The reversal of 1050991561 is 1651990501.

The square root of 1050991561 is 32419.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 818246025 + 232745536 = 28605^2 + 15256^2 .

It is not a de Polignac number, because 1050991561 - 2⁷ = 1050991433 is a prime.

It is a super-2 number, since 2×1050991561² = 2209166522586433442, which contains 22 as substring.

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 1050991561.

It is not an unprimeable number, because it can be changed into a prime (1050991511) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 550170 + ... + 552076.

Almost surely, 2^1050991561 is an apocalyptic number.

1050991561 is the 32419-th square number.

1050991561 is the 16210-th centered octagonal number.

It is an amenable number.

1050991561 is a deficient number, since it is larger than the sum of its proper divisors (66045438).

1050991561 is an frugal number, since it uses more digits than its factorization.

1050991561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3848 (or 1924 counting only the distinct ones).

The product of its (nonzero) digits is 12150, while the sum is 37.

The cubic root of 1050991561 is about 1016.7161986916.

The spelling of 1050991561 in words is "one billion, fifty million, nine hundred ninety-one thousand, five hundred sixty-one".