42215749 has 2 divisors, whose sum is σ = 42215750. Its totient is φ = 42215748.

The previous prime is 42215731. The next prime is 42215759. The reversal of 42215749 is 94751224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25553025 + 16662724 = 5055^2 + 4082^2 .

It is a cyclic number.

It is not a de Polignac number, because 42215749 - 2⁹ = 42215237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42215759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21107874 + 21107875.

It is an arithmetic number, because the mean of its divisors is an integer number (21107875).

Almost surely, 2^42215749 is an apocalyptic number.

It is an amenable number.

42215749 is a deficient number, since it is larger than the sum of its proper divisors (1).

42215749 is an equidigital number, since it uses as much as digits as its factorization.

42215749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 34.

The square root of 42215749 is about 6497.3647735063. The cubic root of 42215749 is about 348.1968460691.

The spelling of 42215749 in words is "forty-two million, two hundred fifteen thousand, seven hundred forty-nine".