49019352581 has 2 divisors, whose sum is σ = 49019352582. Its totient is φ = 49019352580.

The previous prime is 49019352553. The next prime is 49019352611. The reversal of 49019352581 is 18525391094.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28710252481 + 20309100100 = 169441^2 + 142510^2 .

It is a cyclic number.

It is not a de Polignac number, because 49019352581 - 2⁶ = 49019352517 is a prime.

It is a super-2 number, since 2×49019352581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49019352521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24509676290 + 24509676291.

It is an arithmetic number, because the mean of its divisors is an integer number (24509676291).

Almost surely, 2^49019352581 is an apocalyptic number.

It is an amenable number.

49019352581 is a deficient number, since it is larger than the sum of its proper divisors (1).

49019352581 is an equidigital number, since it uses as much as digits as its factorization.

49019352581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 388800, while the sum is 47.

The spelling of 49019352581 in words is "forty-nine billion, nineteen million, three hundred fifty-two thousand, five hundred eighty-one".