40172549 has 2 divisors, whose sum is σ = 40172550. Its totient is φ = 40172548.

The previous prime is 40172543. The next prime is 40172551. The reversal of 40172549 is 94527104.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32433025 + 7739524 = 5695^2 + 2782^2 .

It is a cyclic number.

It is not a de Polignac number, because 40172549 - 2⁴ = 40172533 is a prime.

It is a super-2 number, since 2×40172549² = 3227667386314802, which contains 22 as substring.

Together with 40172551, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40172543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20086274 + 20086275.

It is an arithmetic number, because the mean of its divisors is an integer number (20086275).

Almost surely, 2^40172549 is an apocalyptic number.

It is an amenable number.

40172549 is a deficient number, since it is larger than the sum of its proper divisors (1).

40172549 is an equidigital number, since it uses as much as digits as its factorization.

40172549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 40172549 is about 6338.1818370886. The cubic root of 40172549 is about 342.4862416552.

The spelling of 40172549 in words is "forty million, one hundred seventy-two thousand, five hundred forty-nine".