42690971 has 2 divisors, whose sum is σ = 42690972. Its totient is φ = 42690970.

The previous prime is 42690953. The next prime is 42691003. The reversal of 42690971 is 17909624.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42690971 - 2¹⁰ = 42689947 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 (42690941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21345485 + 21345486.

It is an arithmetic number, because the mean of its divisors is an integer number (21345486).

Almost surely, 2^42690971 is an apocalyptic number.

42690971 is a deficient number, since it is larger than the sum of its proper divisors (1).

42690971 is an equidigital number, since it uses as much as digits as its factorization.

42690971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 42690971 is about 6533.8327955343. The cubic root of 42690971 is about 349.4985226465.

The spelling of 42690971 in words is "forty-two million, six hundred ninety thousand, nine hundred seventy-one".