51490849 has 4 divisors (see below), whose sum is σ = 51832000. Its totient is φ = 51149700.

The previous prime is 51490843. The next prime is 51490883. The reversal of 51490849 is 94809415.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94809415 = 5 ⋅18961883.

It is a cyclic number.

It is not a de Polignac number, because 51490849 - 2²⁵ = 17936417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51490843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170349 + ... + 170650.

It is an arithmetic number, because the mean of its divisors is an integer number (12958000).

Almost surely, 2^51490849 is an apocalyptic number.

It is an amenable number.

51490849 is a deficient number, since it is larger than the sum of its proper divisors (341151).

51490849 is a wasteful number, since it uses less digits than its factorization.

51490849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341150.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 51490849 is about 7175.7124384970. The cubic root of 51490849 is about 372.0289052384.

The spelling of 51490849 in words is "fifty-one million, four hundred ninety thousand, eight hundred forty-nine".