81741537 has 12 divisors (see below), whose sum is σ = 119566720. Its totient is φ = 53804088.

The previous prime is 81741533. The next prime is 81741571. The reversal of 81741537 is 73514718.

81741537 is a `hidden beast` number, since 81 + 7 + 41 + 537 = 666.

It is not a de Polignac number, because 81741537 - 2² = 81741533 is a prime.

It is a super-2 number, since 2×81741537² = 13363357742244738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81741533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56773 + ... + 58194.

Almost surely, 2^81741537 is an apocalyptic number.

It is an amenable number.

81741537 is a deficient number, since it is larger than the sum of its proper divisors (37825183).

81741537 is a wasteful number, since it uses less digits than its factorization.

81741537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115052 (or 115049 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 81741537 is about 9041.1026429302. The cubic root of 81741537 is about 433.9912097294.

The spelling of 81741537 in words is "eighty-one million, seven hundred forty-one thousand, five hundred thirty-seven".