42919649 has 2 divisors, whose sum is σ = 42919650. Its totient is φ = 42919648.

The previous prime is 42919619. The next prime is 42919691. The reversal of 42919649 is 94691924.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38688400 + 4231249 = 6220^2 + 2057^2 .

It is a cyclic number.

It is not a de Polignac number, because 42919649 - 2¹² = 42915553 is a prime.

It is equal to p_2599973 and since 42919649 and 2599973 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (42919619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21459824 + 21459825.

It is an arithmetic number, because the mean of its divisors is an integer number (21459825).

Almost surely, 2^42919649 is an apocalyptic number.

It is an amenable number.

42919649 is a deficient number, since it is larger than the sum of its proper divisors (1).

42919649 is an equidigital number, since it uses as much as digits as its factorization.

42919649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 44.

The square root of 42919649 is about 6551.3089531787. The cubic root of 42919649 is about 350.1214517283.

The spelling of 42919649 in words is "forty-two million, nine hundred nineteen thousand, six hundred forty-nine".