1051520661 has 12 divisors (see below), whose sum is σ = 1528183488. Its totient is φ = 696712104.

The previous prime is 1051520653. The next prime is 1051520681. The reversal of 1051520661 is 1660251501.

It is a happy number.

It is not a de Polignac number, because 1051520661 - 2³ = 1051520653 is a prime.

It is a super-2 number, since 2×1051520661² = 2211391401019753842, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1051520611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 356925 + ... + 359858.

It is an arithmetic number, because the mean of its divisors is an integer number (127348624).

Almost surely, 2^1051520661 is an apocalyptic number.

It is an amenable number.

1051520661 is a deficient number, since it is larger than the sum of its proper divisors (476662827).

1051520661 is a wasteful number, since it uses less digits than its factorization.

1051520661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716952 (or 716949 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 1051520661 is about 32427.1593112934. The cubic root of 1051520661 is about 1016.8867849943.

The spelling of 1051520661 in words is "one billion, fifty-one million, five hundred twenty thousand, six hundred sixty-one".