1051165621 has 8 divisors (see below), whose sum is σ = 1147817664. Its totient is φ = 954695520.

The previous prime is 1051165571. The next prime is 1051165631. The reversal of 1051165621 is 1265611501.

It is a happy number.

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 1051165621 - 2¹⁵ = 1051132853 is a prime.

It is a super-2 number, since 2×1051165621² = 2209898325544631282, 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 1051165621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1051165631) 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, 33256 + ... + 56641.

It is an arithmetic number, because the mean of its divisors is an integer number (143477208).

Almost surely, 2^1051165621 is an apocalyptic number.

1051165621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1051165621 is a deficient number, since it is larger than the sum of its proper divisors (96652043).

1051165621 is a wasteful number, since it uses less digits than its factorization.

1051165621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90971.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 1051165621 is about 32421.6844257050. The cubic root of 1051165621 is about 1016.7723234216.

The spelling of 1051165621 in words is "one billion, fifty-one million, one hundred sixty-five thousand, six hundred twenty-one".