1016285721 has 16 divisors (see below), whose sum is σ = 1565189568. Its totient is φ = 579699200.

The previous prime is 1016285713. The next prime is 1016285729. The reversal of 1016285721 is 1275826101.

It is an interprime number because it is at equal distance from previous prime (1016285713) and next prime (1016285729).

It is a cyclic number.

It is not a de Polignac number, because 1016285721 - 2³ = 1016285713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (1016285729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 905220 + ... + 906341.

It is an arithmetic number, because the mean of its divisors is an integer number (97824348).

Almost surely, 2^1016285721 is an apocalyptic number.

1016285721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1016285721 is a deficient number, since it is larger than the sum of its proper divisors (548903847).

1016285721 is a wasteful number, since it uses less digits than its factorization.

1016285721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1811592.

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 1016285721 is about 31879.2365184614. The cubic root of 1016285721 is about 1005.3993680221.

The spelling of 1016285721 in words is "one billion, sixteen million, two hundred eighty-five thousand, seven hundred twenty-one".