51663091 has 2 divisors, whose sum is σ = 51663092. Its totient is φ = 51663090.

The previous prime is 51663089. The next prime is 51663107. The reversal of 51663091 is 19036615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51663091 - 2¹ = 51663089 is a prime.

Together with 51663089, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51663041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25831545 + 25831546.

It is an arithmetic number, because the mean of its divisors is an integer number (25831546).

Almost surely, 2^51663091 is an apocalyptic number.

51663091 is a deficient number, since it is larger than the sum of its proper divisors (1).

51663091 is an equidigital number, since it uses as much as digits as its factorization.

51663091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 51663091 is about 7187.7041536224. The cubic root of 51663091 is about 372.4432680894.

The spelling of 51663091 in words is "fifty-one million, six hundred sixty-three thousand, ninety-one".