42993491 has 2 divisors, whose sum is σ = 42993492. Its totient is φ = 42993490.

The previous prime is 42993451. The next prime is 42993499. The reversal of 42993491 is 19439924.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42993491 - 2⁶ = 42993427 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42993499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21496745 + 21496746.

It is an arithmetic number, because the mean of its divisors is an integer number (21496746).

Almost surely, 2^42993491 is an apocalyptic number.

42993491 is a deficient number, since it is larger than the sum of its proper divisors (1).

42993491 is an equidigital number, since it uses as much as digits as its factorization.

42993491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 41.

The square root of 42993491 is about 6556.9421989217. The cubic root of 42993491 is about 350.3221279234.

The spelling of 42993491 in words is "forty-two million, nine hundred ninety-three thousand, four hundred ninety-one".