42101531 has 2 divisors, whose sum is σ = 42101532. Its totient is φ = 42101530.

The previous prime is 42101513. The next prime is 42101551. The reversal of 42101531 is 13510124.

Together with previous prime (42101513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42101531 - 2⁶ = 42101467 is a prime.

It is a super-2 number, since 2×42101531² = 3545077825087922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42101551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21050765 + 21050766.

It is an arithmetic number, because the mean of its divisors is an integer number (21050766).

Almost surely, 2^42101531 is an apocalyptic number.

42101531 is a deficient number, since it is larger than the sum of its proper divisors (1).

42101531 is an equidigital number, since it uses as much as digits as its factorization.

42101531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 42101531 is about 6488.5692567776. The cubic root of 42101531 is about 347.8825378660.

Adding to 42101531 its reverse (13510124), we get a palindrome (55611655).

The spelling of 42101531 in words is "forty-two million, one hundred one thousand, five hundred thirty-one".