51091349 has 6 divisors (see below), whose sum is σ = 53409846. Its totient is φ = 48869480.

The previous prime is 51091333. The next prime is 51091357. The reversal of 51091349 is 94319015.

It can be written as a sum of positive squares in only one way, i.e., 27984100 + 23107249 = 5290^2 + 4807^2 .

It is not a de Polignac number, because 51091349 - 2⁴ = 51091333 is a prime.

It is a super-2 number, since 2×51091349² = 5220651885279602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51091309) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 47762 + ... + 48819.

It is an arithmetic number, because the mean of its divisors is an integer number (8901641).

Almost surely, 2^51091349 is an apocalyptic number.

It is an amenable number.

51091349 is a deficient number, since it is larger than the sum of its proper divisors (2318497).

51091349 is an equidigital number, since it uses as much as digits as its factorization.

51091349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96627 (or 96604 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 51091349 is about 7147.8212764450. The cubic root of 51091349 is about 371.0642575108.

The spelling of 51091349 in words is "fifty-one million, ninety-one thousand, three hundred forty-nine".