1056620721 has 8 divisors (see below), whose sum is σ = 1517199040. Its totient is φ = 650228112.

The previous prime is 1056620699. The next prime is 1056620731. The reversal of 1056620721 is 1270266501.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1056620721 - 2¹⁵ = 1056587953 is a prime.

It is a super-2 number, since 2×1056620721² = 2232894696093119682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1056620731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13546381 + ... + 13546458.

It is an arithmetic number, because the mean of its divisors is an integer number (189649880).

Almost surely, 2^1056620721 is an apocalyptic number.

It is an amenable number.

1056620721 is a deficient number, since it is larger than the sum of its proper divisors (460578319).

1056620721 is a wasteful number, since it uses less digits than its factorization.

1056620721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27092855.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 1056620721 is about 32505.7028996452. The cubic root of 1056620721 is about 1018.5281607322.

The spelling of 1056620721 in words is "one billion, fifty-six million, six hundred twenty thousand, seven hundred twenty-one".