40311721 has 2 divisors, whose sum is σ = 40311722. Its totient is φ = 40311720.

The previous prime is 40311679. The next prime is 40311727. The reversal of 40311721 is 12711304.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37687321 + 2624400 = 6139^2 + 1620^2 .

It is a cyclic number.

It is not a de Polignac number, because 40311721 - 2⁹ = 40311209 is a prime.

It is not a weakly prime, because it can be changed into another prime (40311727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20155860 + 20155861.

It is an arithmetic number, because the mean of its divisors is an integer number (20155861).

Almost surely, 2^40311721 is an apocalyptic number.

It is an amenable number.

40311721 is a deficient number, since it is larger than the sum of its proper divisors (1).

40311721 is an equidigital number, since it uses as much as digits as its factorization.

40311721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 40311721 is about 6349.1512031137. The cubic root of 40311721 is about 342.8812838739.

The spelling of 40311721 in words is "forty million, three hundred eleven thousand, seven hundred twenty-one".