537691 has 8 divisors (see below), whose sum is σ = 670464. Its totient is φ = 418920.

The previous prime is 537679. The next prime is 537703. The reversal of 537691 is 196735.

537691 = T₂₁₀ + T₂₁₁ + ... + T₂₃₁.

It is an interprime number because it is at equal distance from previous prime (537679) and next prime (537703).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-537691 is a prime.

It is a super-2 number, since 2×537691² = 578223222962, which contains 22 as substring.

It is a d-powerful number, because it can be written as 5⁷ + 3¹¹ + 6⁷ + 7⁴ + 9² + 1 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (537611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3415 + ... + 3568.

It is an arithmetic number, because the mean of its divisors is an integer number (83808).

2⁵³⁷⁶⁹¹ is an apocalyptic number.

537691 is a deficient number, since it is larger than the sum of its proper divisors (132773).

537691 is a wasteful number, since it uses less digits than its factorization.

537691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7001.

The product of its digits is 5670, while the sum is 31.

The square root of 537691 is about 733.2741642796. The cubic root of 537691 is about 81.3162961866.

It can be divided in two parts, 53 and 7691, that added together give a square (7744 = 88²).

The spelling of 537691 in words is "five hundred thirty-seven thousand, six hundred ninety-one".