22507157 has 2 divisors, whose sum is σ = 22507158. Its totient is φ = 22507156.

The previous prime is 22507123. The next prime is 22507171. The reversal of 22507157 is 75170522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15319396 + 7187761 = 3914^2 + 2681^2 .

It is a cyclic number.

It is not a de Polignac number, because 22507157 - 2¹⁴ = 22490773 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22507117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11253578 + 11253579.

It is an arithmetic number, because the mean of its divisors is an integer number (11253579).

Almost surely, 2^22507157 is an apocalyptic number.

It is an amenable number.

22507157 is a deficient number, since it is larger than the sum of its proper divisors (1).

22507157 is an equidigital number, since it uses as much as digits as its factorization.

22507157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4900, while the sum is 29.

The square root of 22507157 is about 4744.1708443099. The cubic root of 22507157 is about 282.3407388015.

Adding to 22507157 its reverse (75170522), we get a palindrome (97677679).

The spelling of 22507157 in words is "twenty-two million, five hundred seven thousand, one hundred fifty-seven".