42720901 has 2 divisors, whose sum is σ = 42720902. Its totient is φ = 42720900.

The previous prime is 42720889. The next prime is 42720919. The reversal of 42720901 is 10902724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26728900 + 15992001 = 5170^2 + 3999^2 .

It is a cyclic number.

It is not a de Polignac number, because 42720901 - 2⁵ = 42720869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42720961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21360450 + 21360451.

It is an arithmetic number, because the mean of its divisors is an integer number (21360451).

Almost surely, 2^42720901 is an apocalyptic number.

It is an amenable number.

42720901 is a deficient number, since it is larger than the sum of its proper divisors (1).

42720901 is an equidigital number, since it uses as much as digits as its factorization.

42720901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 42720901 is about 6536.1227803645. The cubic root of 42720901 is about 349.5801796255.

The spelling of 42720901 in words is "forty-two million, seven hundred twenty thousand, nine hundred one".