42102981 has 6 divisors (see below), whose sum is σ = 60815430. Its totient is φ = 28068648.

The previous prime is 42102979. The next prime is 42103043. The reversal of 42102981 is 18920124.

It can be written as a sum of positive squares in only one way, i.e., 35212356 + 6890625 = 5934^2 + 2625^2 .

It is not a de Polignac number, because 42102981 - 2¹ = 42102979 is a prime.

It is a super-2 number, since 2×42102981² = 3545322018172722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42102911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2339046 + ... + 2339063.

It is an arithmetic number, because the mean of its divisors is an integer number (10135905).

Almost surely, 2^42102981 is an apocalyptic number.

It is an amenable number.

42102981 is a deficient number, since it is larger than the sum of its proper divisors (18712449).

42102981 is a wasteful number, since it uses less digits than its factorization.

42102981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4678115 (or 4678112 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 42102981 is about 6488.6809907715. The cubic root of 42102981 is about 347.8865315758.

The spelling of 42102981 in words is "forty-two million, one hundred two thousand, nine hundred eighty-one".