49215557 has 2 divisors, whose sum is σ = 49215558. Its totient is φ = 49215556.

The previous prime is 49215553. The next prime is 49215601. The reversal of 49215557 is 75551294.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35628961 + 13586596 = 5969^2 + 3686^2 .

It is a cyclic number.

It is not a de Polignac number, because 49215557 - 2² = 49215553 is a prime.

It is a Chen prime.

It is equal to p_2956745 and since 49215557 and 2956745 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 49215557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49215553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24607778 + 24607779.

It is an arithmetic number, because the mean of its divisors is an integer number (24607779).

Almost surely, 2^49215557 is an apocalyptic number.

It is an amenable number.

49215557 is a deficient number, since it is larger than the sum of its proper divisors (1).

49215557 is an equidigital number, since it uses as much as digits as its factorization.

49215557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63000, while the sum is 38.

The square root of 49215557 is about 7015.3800324715. The cubic root of 49215557 is about 366.4663772062.

The spelling of 49215557 in words is "forty-nine million, two hundred fifteen thousand, five hundred fifty-seven".