51099901 has 2 divisors, whose sum is σ = 51099902. Its totient is φ = 51099900.

The previous prime is 51099877. The next prime is 51099913. The reversal of 51099901 is 10999015.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25999801 + 25100100 = 5099^2 + 5010^2 .

It is a cyclic number.

It is not a de Polignac number, because 51099901 - 2¹¹ = 51097853 is a prime.

It is a super-2 number, since 2×51099901² = 5222399764419602, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51099931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25549950 + 25549951.

It is an arithmetic number, because the mean of its divisors is an integer number (25549951).

Almost surely, 2^51099901 is an apocalyptic number.

It is an amenable number.

51099901 is a deficient number, since it is larger than the sum of its proper divisors (1).

51099901 is an equidigital number, since it uses as much as digits as its factorization.

51099901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3645, while the sum is 34.

The square root of 51099901 is about 7148.4194756603. The cubic root of 51099901 is about 371.0849600664.

The spelling of 51099901 in words is "fifty-one million, ninety-nine thousand, nine hundred one".