537981 has 4 divisors (see below), whose sum is σ = 717312. Its totient is φ = 358652.

The previous prime is 537941. The next prime is 537991. The reversal of 537981 is 189735.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 537981 - 2⁷ = 537853 is a prime.

It is a super-2 number, since 2×537981² = 578847112722, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (537941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89661 + ... + 89666.

It is an arithmetic number, because the mean of its divisors is an integer number (179328).

2⁵³⁷⁹⁸¹ is an apocalyptic number.

It is an amenable number.

537981 is a deficient number, since it is larger than the sum of its proper divisors (179331).

537981 is a wasteful number, since it uses less digits than its factorization.

537981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179330.

The product of its digits is 7560, while the sum is 33.

The square root of 537981 is about 733.4718808516. The cubic root of 537981 is about 81.3309126904.

It can be divided in two parts, 5379 and 81, that added together give a triangular number (5460 = T₁₀₄).

The spelling of 537981 in words is "five hundred thirty-seven thousand, nine hundred eighty-one".