40513217 has 2 divisors, whose sum is σ = 40513218. Its totient is φ = 40513216.

The previous prime is 40513177. The next prime is 40513219. The reversal of 40513217 is 71231504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40056241 + 456976 = 6329^2 + 676^2 .

It is a cyclic number.

It is not a de Polignac number, because 40513217 - 2⁶ = 40513153 is a prime.

Together with 40513219, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 40513192 and 40513201.

It is not a weakly prime, because it can be changed into another prime (40513219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20256608 + 20256609.

It is an arithmetic number, because the mean of its divisors is an integer number (20256609).

Almost surely, 2^40513217 is an apocalyptic number.

It is an amenable number.

40513217 is a deficient number, since it is larger than the sum of its proper divisors (1).

40513217 is an equidigital number, since it uses as much as digits as its factorization.

40513217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 40513217 is about 6364.9993715632. Note that the first 3 decimals coincide. The cubic root of 40513217 is about 343.4516259576.

The spelling of 40513217 in words is "forty million, five hundred thirteen thousand, two hundred seventeen".