16100981 has 4 divisors (see below), whose sum is σ = 17339532. Its totient is φ = 14862432.

The previous prime is 16100951. The next prime is 16101013. The reversal of 16100981 is 18900161.

16100981 is nontrivially palindromic in base 12.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18900161 = 7 ⋅2700023.

It can be written as a sum of positive squares in 2 ways, for example, as 1918225 + 14182756 = 1385^2 + 3766^2 .

It is not a de Polignac number, because 16100981 - 2¹⁴ = 16084597 is a prime.

It is a super-2 number, since 2×16100981² = 518483178324722, 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 16100981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16100941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 619256 + ... + 619281.

It is an arithmetic number, because the mean of its divisors is an integer number (4334883).

Almost surely, 2^16100981 is an apocalyptic number.

It is an amenable number.

16100981 is a deficient number, since it is larger than the sum of its proper divisors (1238551).

16100981 is a wasteful number, since it uses less digits than its factorization.

16100981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1238550.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 16100981 is about 4012.6027712695. The cubic root of 16100981 is about 252.5132156596.

The spelling of 16100981 in words is "sixteen million, one hundred thousand, nine hundred eighty-one".