22491901 has 4 divisors (see below), whose sum is σ = 23814972. Its totient is φ = 21168832.

The previous prime is 22491899. The next prime is 22491913. The reversal of 22491901 is 10919422.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10919422 = 2 ⋅5459711.

It can be written as a sum of positive squares in 2 ways, for example, as 12888100 + 9603801 = 3590^2 + 3099^2 .

It is a cyclic number.

It is not a de Polignac number, because 22491901 - 2¹ = 22491899 is a prime.

It is a super-2 number, since 2×22491901² = 1011771221187602, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22491901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22491941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 661510 + ... + 661543.

It is an arithmetic number, because the mean of its divisors is an integer number (5953743).

Almost surely, 2^22491901 is an apocalyptic number.

It is an amenable number.

22491901 is a deficient number, since it is larger than the sum of its proper divisors (1323071).

22491901 is a wasteful number, since it uses less digits than its factorization.

22491901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323070.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 22491901 is about 4742.5627038554. The cubic root of 22491901 is about 282.2769314846.

The spelling of 22491901 in words is "twenty-two million, four hundred ninety-one thousand, nine hundred one".