42215969 has 2 divisors, whose sum is σ = 42215970. Its totient is φ = 42215968.

The previous prime is 42215939. The next prime is 42215977. The reversal of 42215969 is 96951224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39526369 + 2689600 = 6287^2 + 1640^2 .

It is a cyclic number.

It is not a de Polignac number, because 42215969 - 2⁸ = 42215713 is a prime.

It is a super-2 number, since 2×42215969² = 3564376077217922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (42215939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21107984 + 21107985.

It is an arithmetic number, because the mean of its divisors is an integer number (21107985).

Almost surely, 2^42215969 is an apocalyptic number.

It is an amenable number.

42215969 is a deficient number, since it is larger than the sum of its proper divisors (1).

42215969 is an equidigital number, since it uses as much as digits as its factorization.

42215969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 38.

The square root of 42215969 is about 6497.3817034248. The cubic root of 42215969 is about 348.1974509238.

The spelling of 42215969 in words is "forty-two million, two hundred fifteen thousand, nine hundred sixty-nine".