42051517 has 2 divisors, whose sum is σ = 42051518. Its totient is φ = 42051516.

The previous prime is 42051491. The next prime is 42051533. The reversal of 42051517 is 71515024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27657081 + 14394436 = 5259^2 + 3794^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42051517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42051491 and 42051500.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42051547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21025758 + 21025759.

It is an arithmetic number, because the mean of its divisors is an integer number (21025759).

Almost surely, 2^42051517 is an apocalyptic number.

It is an amenable number.

42051517 is a deficient number, since it is larger than the sum of its proper divisors (1).

42051517 is an equidigital number, since it uses as much as digits as its factorization.

42051517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 42051517 is about 6484.7141031814. The cubic root of 42051517 is about 347.7447290102.

The spelling of 42051517 in words is "forty-two million, fifty-one thousand, five hundred seventeen".