22561949 has 4 divisors (see below), whose sum is σ = 23749440. Its totient is φ = 21374460.

The previous prime is 22561943. The next prime is 22561951. The reversal of 22561949 is 94916522.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94916522 = 2 ⋅47458261.

It is a cyclic number.

It is not a de Polignac number, because 22561949 - 2⁴ = 22561933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22561943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 593717 + ... + 593754.

It is an arithmetic number, because the mean of its divisors is an integer number (5937360).

Almost surely, 2^22561949 is an apocalyptic number.

It is an amenable number.

22561949 is a deficient number, since it is larger than the sum of its proper divisors (1187491).

22561949 is a wasteful number, since it uses less digits than its factorization.

22561949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1187490.

The product of its digits is 38880, while the sum is 38.

The square root of 22561949 is about 4749.9419996459. The cubic root of 22561949 is about 282.5696656444.

It can be divided in two parts, 22 and 561949, that multiplied together give a triangular number (12362878 = T₄₉₇₂).

The spelling of 22561949 in words is "twenty-two million, five hundred sixty-one thousand, nine hundred forty-nine".