44190781 has 2 divisors, whose sum is σ = 44190782. Its totient is φ = 44190780.

The previous prime is 44190749. The next prime is 44190791. The reversal of 44190781 is 18709144.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30802500 + 13388281 = 5550^2 + 3659^2 .

It is a cyclic number.

It is not a de Polignac number, because 44190781 - 2⁵ = 44190749 is a prime.

It is a super-2 number, since 2×44190781² = 3905650250779922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (44190791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22095390 + 22095391.

It is an arithmetic number, because the mean of its divisors is an integer number (22095391).

Almost surely, 2^44190781 is an apocalyptic number.

It is an amenable number.

44190781 is a deficient number, since it is larger than the sum of its proper divisors (1).

44190781 is an equidigital number, since it uses as much as digits as its factorization.

44190781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 44190781 is about 6647.6146849829. The cubic root of 44190781 is about 353.5443428306.

The spelling of 44190781 in words is "forty-four million, one hundred ninety thousand, seven hundred eighty-one".