49451821 has 2 divisors, whose sum is σ = 49451822. Its totient is φ = 49451820.

The previous prime is 49451807. The next prime is 49451837. The reversal of 49451821 is 12815494.

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., 34928100 + 14523721 = 5910^2 + 3811^2 .

It is a cyclic number.

It is not a de Polignac number, because 49451821 - 2⁹ = 49451309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49451881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24725910 + 24725911.

It is an arithmetic number, because the mean of its divisors is an integer number (24725911).

Almost surely, 2^49451821 is an apocalyptic number.

It is an amenable number.

49451821 is a deficient number, since it is larger than the sum of its proper divisors (1).

49451821 is an equidigital number, since it uses as much as digits as its factorization.

49451821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 34.

The square root of 49451821 is about 7032.1988737521. The cubic root of 49451821 is about 367.0518603072.

The spelling of 49451821 in words is "forty-nine million, four hundred fifty-one thousand, eight hundred twenty-one".