55690447 has 2 divisors, whose sum is σ = 55690448. Its totient is φ = 55690446.

The previous prime is 55690373. The next prime is 55690457. The reversal of 55690447 is 74409655.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55690447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55690457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27845223 + 27845224.

It is an arithmetic number, because the mean of its divisors is an integer number (27845224).

Almost surely, 2^55690447 is an apocalyptic number.

55690447 is a deficient number, since it is larger than the sum of its proper divisors (1).

55690447 is an equidigital number, since it uses as much as digits as its factorization.

55690447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 55690447 is about 7462.6032321168. The cubic root of 55690447 is about 381.8799888898.

The spelling of 55690447 in words is "fifty-five million, six hundred ninety thousand, four hundred forty-seven".