42540497 has 2 divisors, whose sum is σ = 42540498. Its totient is φ = 42540496.

The previous prime is 42540461. The next prime is 42540517. The reversal of 42540497 is 79404524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36857041 + 5683456 = 6071^2 + 2384^2 .

It is a cyclic number.

It is not a de Polignac number, because 42540497 - 2¹⁰ = 42539473 is a prime.

It is equal to p_2578481 and since 42540497 and 2578481 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (42540437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21270248 + 21270249.

It is an arithmetic number, because the mean of its divisors is an integer number (21270249).

Almost surely, 2^42540497 is an apocalyptic number.

It is an amenable number.

42540497 is a deficient number, since it is larger than the sum of its proper divisors (1).

42540497 is an equidigital number, since it uses as much as digits as its factorization.

42540497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 42540497 is about 6522.3076437715. The cubic root of 42540497 is about 349.0874103378.

The spelling of 42540497 in words is "forty-two million, five hundred forty thousand, four hundred ninety-seven".