75561139 has 2 divisors, whose sum is σ = 75561140. Its totient is φ = 75561138.

The previous prime is 75561133. The next prime is 75561149. The reversal of 75561139 is 93116557.

It is a weak prime.

It is an emirp because it is prime and its reverse (93116557) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75561139 - 2³ = 75561131 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 75561098 and 75561107.

It is not a weakly prime, because it can be changed into another prime (75561131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37780569 + 37780570.

It is an arithmetic number, because the mean of its divisors is an integer number (37780570).

Almost surely, 2^75561139 is an apocalyptic number.

75561139 is a deficient number, since it is larger than the sum of its proper divisors (1).

75561139 is an equidigital number, since it uses as much as digits as its factorization.

75561139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28350, while the sum is 37.

The square root of 75561139 is about 8692.5910406507. The cubic root of 75561139 is about 422.7654604279.

The spelling of 75561139 in words is "seventy-five million, five hundred sixty-one thousand, one hundred thirty-nine".