44157781 has 2 divisors, whose sum is σ = 44157782. Its totient is φ = 44157780.

The previous prime is 44157739. The next prime is 44157787. The reversal of 44157781 is 18775144.

44157781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25959025 + 18198756 = 5095^2 + 4266^2 .

It is a cyclic number.

It is not a de Polignac number, because 44157781 - 2¹¹ = 44155733 is a prime.

It is a super-2 number, since 2×44157781² = 3899819245687922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 44157781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (44157787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22078890 + 22078891.

It is an arithmetic number, because the mean of its divisors is an integer number (22078891).

Almost surely, 2^44157781 is an apocalyptic number.

It is an amenable number.

44157781 is a deficient number, since it is larger than the sum of its proper divisors (1).

44157781 is an equidigital number, since it uses as much as digits as its factorization.

44157781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31360, while the sum is 37.

The square root of 44157781 is about 6645.1321281070. The cubic root of 44157781 is about 353.4563164112.

The spelling of 44157781 in words is "forty-four million, one hundred fifty-seven thousand, seven hundred eighty-one".