51099947 has 2 divisors, whose sum is σ = 51099948. Its totient is φ = 51099946.

The previous prime is 51099941. The next prime is 51099967. The reversal of 51099947 is 74999015.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51099947 - 2⁴ = 51099931 is a prime.

It is a super-2 number, since 2×51099947² = 5222409166805618, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51099898 and 51099907.

It is not a weakly prime, because it can be changed into another prime (51099941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25549973 + 25549974.

It is an arithmetic number, because the mean of its divisors is an integer number (25549974).

Almost surely, 2^51099947 is an apocalyptic number.

51099947 is a deficient number, since it is larger than the sum of its proper divisors (1).

51099947 is an equidigital number, since it uses as much as digits as its factorization.

51099947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 44.

The square root of 51099947 is about 7148.4226931541. The cubic root of 51099947 is about 371.0850714163.

The spelling of 51099947 in words is "fifty-one million, ninety-nine thousand, nine hundred forty-seven".