48391561 has 2 divisors, whose sum is σ = 48391562. Its totient is φ = 48391560.

The previous prime is 48391549. The next prime is 48391601. The reversal of 48391561 is 16519384.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48385936 + 5625 = 6956^2 + 75^2 .

It is a cyclic number.

It is not a de Polignac number, because 48391561 - 2¹⁹ = 47867273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 48391561.

It is not a weakly prime, because it can be changed into another prime (48391261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24195780 + 24195781.

It is an arithmetic number, because the mean of its divisors is an integer number (24195781).

Almost surely, 2^48391561 is an apocalyptic number.

It is an amenable number.

48391561 is a deficient number, since it is larger than the sum of its proper divisors (1).

48391561 is an equidigital number, since it uses as much as digits as its factorization.

48391561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 37.

The square root of 48391561 is about 6956.4043154492. The cubic root of 48391561 is about 364.4096568279.

It can be divided in two parts, 4839 and 1561, that added together give a square (6400 = 80²).

The spelling of 48391561 in words is "forty-eight million, three hundred ninety-one thousand, five hundred sixty-one".