1065621551 has 8 divisors (see below), whose sum is σ = 1086221664. Its totient is φ = 1045039840.

The previous prime is 1065621541. The next prime is 1065621569. The reversal of 1065621551 is 1551265601.

1065621551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 1065621551 - 2¹⁰ = 1065620527 is a prime.

It is a super-2 number, since 2×1065621551² = 2271098579911291202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1065621521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191825 + ... + 197301.

It is an arithmetic number, because the mean of its divisors is an integer number (135777708).

Almost surely, 2^1065621551 is an apocalyptic number.

1065621551 is a deficient number, since it is larger than the sum of its proper divisors (20600113).

1065621551 is an equidigital number, since it uses as much as digits as its factorization.

1065621551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9201.

The product of its (nonzero) digits is 9000, while the sum is 32.

The square root of 1065621551 is about 32643.8593153444. The cubic root of 1065621551 is about 1021.4120999819.

The spelling of 1065621551 in words is "one billion, sixty-five million, six hundred twenty-one thousand, five hundred fifty-one".