91937643 has 8 divisors (see below), whose sum is σ = 140095488. Its totient is φ = 52535784.

The previous prime is 91937639. The next prime is 91937663. The reversal of 91937643 is 34673919.

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

It is not a de Polignac number, because 91937643 - 2² = 91937639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91937595 and 91937604.

It is not an unprimeable number, because it can be changed into a prime (91937603) 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, 2188971 + ... + 2189012.

It is an arithmetic number, because the mean of its divisors is an integer number (17511936).

Almost surely, 2^91937643 is an apocalyptic number.

91937643 is a deficient number, since it is larger than the sum of its proper divisors (48157845).

91937643 is a wasteful number, since it uses less digits than its factorization.

91937643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4377993.

The product of its digits is 122472, while the sum is 42.

The square root of 91937643 is about 9588.4119123033. The cubic root of 91937643 is about 451.3337270943. Note that the first 3 decimals are identical.

It can be divided in two parts, 9193 and 7643, that added together give a triangular number (16836 = T₁₈₃).

The spelling of 91937643 in words is "ninety-one million, nine hundred thirty-seven thousand, six hundred forty-three".