22261491 has 24 divisors (see below), whose sum is σ = 36900864. Its totient is φ = 12668400.

The previous prime is 22261471. The next prime is 22261507. The reversal of 22261491 is 19416222.

It is not a de Polignac number, because 22261491 - 2⁶ = 22261427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22261451) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18766 + ... + 19916.

It is an arithmetic number, because the mean of its divisors is an integer number (1537536).

Almost surely, 2^22261491 is an apocalyptic number.

22261491 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

22261491 is a deficient number, since it is larger than the sum of its proper divisors (14639373).

22261491 is a wasteful number, since it uses less digits than its factorization.

22261491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471 (or 1468 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 22261491 is about 4718.2084523683. The cubic root of 22261491 is about 281.3097271671.

The spelling of 22261491 in words is "twenty-two million, two hundred sixty-one thousand, four hundred ninety-one".