1016398161 has 9 divisors (see below), whose sum is σ = 1468268841. Its totient is φ = 677535012.

The previous prime is 1016398153. The next prime is 1016398169. The reversal of 1016398161 is 1618936101.

It is a happy number.

The square root of 1016398161 is 31881.

It is a perfect power (a square), and thus also a powerful number.

1016398161 is a `hidden beast` number, since 1 + 0 + 1 + 639 + 8 + 16 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (1016398153) and next prime (1016398169).

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1016398161 - 2³ = 1016398153 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1016398169) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 90330 + ... + 100956.

Almost surely, 2^1016398161 is an apocalyptic number.

1016398161 is the 31881-st square number.

1016398161 is the 15941-st centered octagonal number.

It is an amenable number.

1016398161 is a deficient number, since it is larger than the sum of its proper divisors (451870680).

1016398161 is an frugal number, since it uses more digits than its factorization.

1016398161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21260 (or 10630 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The cubic root of 1016398161 is about 1005.4364451726.

Multiplying 1016398161 by its sum of digits (36), we get a square (36590333796 = 191286²).

The spelling of 1016398161 in words is "one billion, sixteen million, three hundred ninety-eight thousand, one hundred sixty-one".