51205699 has 2 divisors, whose sum is σ = 51205700. Its totient is φ = 51205698.

The previous prime is 51205663. The next prime is 51205709. The reversal of 51205699 is 99650215.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51205699 - 2¹³ = 51197507 is a prime.

It is a super-2 number, since 2×51205699² = 5244047220157202, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51205639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25602849 + 25602850.

It is an arithmetic number, because the mean of its divisors is an integer number (25602850).

Almost surely, 2^51205699 is an apocalyptic number.

51205699 is a deficient number, since it is larger than the sum of its proper divisors (1).

51205699 is an equidigital number, since it uses as much as digits as its factorization.

51205699 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 51205699 is about 7155.8157466497. The cubic root of 51205699 is about 371.3408834772.

The spelling of 51205699 in words is "fifty-one million, two hundred five thousand, six hundred ninety-nine".