22749491 has 2 divisors, whose sum is σ = 22749492. Its totient is φ = 22749490.

The previous prime is 22749449. The next prime is 22749497. The reversal of 22749491 is 19494722.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22749491 is a prime.

It is a super-3 number, since 3×22749491³ (a number of 23 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22749497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11374745 + 11374746.

It is an arithmetic number, because the mean of its divisors is an integer number (11374746).

Almost surely, 2^22749491 is an apocalyptic number.

22749491 is a deficient number, since it is larger than the sum of its proper divisors (1).

22749491 is an equidigital number, since it uses as much as digits as its factorization.

22749491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 38.

The square root of 22749491 is about 4769.6426490881. The cubic root of 22749491 is about 283.3504421810.

The spelling of 22749491 in words is "twenty-two million, seven hundred forty-nine thousand, four hundred ninety-one".