42648691 has 2 divisors, whose sum is σ = 42648692. Its totient is φ = 42648690.

The previous prime is 42648689. The next prime is 42648701. The reversal of 42648691 is 19684624.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42648691 - 2¹ = 42648689 is a prime.

Together with 42648689, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42648791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21324345 + 21324346.

It is an arithmetic number, because the mean of its divisors is an integer number (21324346).

Almost surely, 2^42648691 is an apocalyptic number.

42648691 is a deficient number, since it is larger than the sum of its proper divisors (1).

42648691 is an equidigital number, since it uses as much as digits as its factorization.

42648691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 40.

The square root of 42648691 is about 6530.5965271176. The cubic root of 42648691 is about 349.3831065288.

The spelling of 42648691 in words is "forty-two million, six hundred forty-eight thousand, six hundred ninety-one".