537621991 has 8 divisors (see below), whose sum is σ = 582485904. Its totient is φ = 494229120.

The previous prime is 537621989. The next prime is 537622009. The reversal of 537621991 is 199126735.

537621991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 537621991 - 2¹ = 537621989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (537621961) 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, 367000 + ... + 368461.

It is an arithmetic number, because the mean of its divisors is an integer number (72810738).

Almost surely, 2^537621991 is an apocalyptic number.

537621991 is a deficient number, since it is larger than the sum of its proper divisors (44863913).

537621991 is a wasteful number, since it uses less digits than its factorization.

537621991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735521.

The product of its digits is 102060, while the sum is 43.

The square root of 537621991 is about 23186.6770150447. The cubic root of 537621991 is about 813.1281723901.

The spelling of 537621991 in words is "five hundred thirty-seven million, six hundred twenty-one thousand, nine hundred ninety-one".