51220449 has 12 divisors (see below), whose sum is σ = 84554496. Its totient is φ = 29268792.

The previous prime is 51220427. The next prime is 51220457. The reversal of 51220449 is 94402215.

It is not a de Polignac number, because 51220449 - 2⁵ = 51220417 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (51220489) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 406449 + ... + 406574.

It is an arithmetic number, because the mean of its divisors is an integer number (7046208).

Almost surely, 2^51220449 is an apocalyptic number.

It is an amenable number.

51220449 is a deficient number, since it is larger than the sum of its proper divisors (33334047).

51220449 is a wasteful number, since it uses less digits than its factorization.

51220449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813036 (or 813033 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 51220449 is about 7156.8463026671. The cubic root of 51220449 is about 371.3765354477.

The spelling of 51220449 in words is "fifty-one million, two hundred twenty thousand, four hundred forty-nine".