6158981 has 4 divisors (see below), whose sum is σ = 6521292. Its totient is φ = 5796672.

The previous prime is 6158969. The next prime is 6159007. The reversal of 6158981 is 1898516.

6158981 = 409² + 410² + ... + 442².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4268356 + 1890625 = 2066^2 + 1375^2 .

It is a cyclic number.

It is not a de Polignac number, because 6158981 - 2¹⁸ = 5896837 is a prime.

It is a super-2 number, since 2×6158981² = 75866093916722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6158941) 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, 181130 + ... + 181163.

It is an arithmetic number, because the mean of its divisors is an integer number (1630323).

Almost surely, 2^6158981 is an apocalyptic number.

It is an amenable number.

6158981 is a deficient number, since it is larger than the sum of its proper divisors (362311).

6158981 is a wasteful number, since it uses less digits than its factorization.

6158981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362310.

The product of its digits is 17280, while the sum is 38.

The square root of 6158981 is about 2481.7294373078. The cubic root of 6158981 is about 183.3030205163.

The spelling of 6158981 in words is "six million, one hundred fifty-eight thousand, nine hundred eighty-one".