49721869 has 2 divisors, whose sum is σ = 49721870. Its totient is φ = 49721868.

The previous prime is 49721851. The next prime is 49721899. The reversal of 49721869 is 96812794.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49519369 + 202500 = 7037^2 + 450^2 .

It is a cyclic number.

It is not a de Polignac number, because 49721869 - 2⁷ = 49721741 is a prime.

It is a super-2 number, since 2×49721869² = 4944528513706322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49721809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24860934 + 24860935.

It is an arithmetic number, because the mean of its divisors is an integer number (24860935).

Almost surely, 2^49721869 is an apocalyptic number.

It is an amenable number.

49721869 is a deficient number, since it is larger than the sum of its proper divisors (1).

49721869 is an equidigital number, since it uses as much as digits as its factorization.

49721869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 46.

The square root of 49721869 is about 7051.3735541382. The cubic root of 49721869 is about 367.7187837584.

It can be divided in two parts, 497 and 21869, that added together give a triangular number (22366 = T₂₁₁).

The spelling of 49721869 in words is "forty-nine million, seven hundred twenty-one thousand, eight hundred sixty-nine".