55351619 has 2 divisors, whose sum is σ = 55351620. Its totient is φ = 55351618.

The previous prime is 55351603. The next prime is 55351627. The reversal of 55351619 is 91615355.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55351619 - 2⁴ = 55351603 is a prime.

It is a super-2 number, since 2×55351619² = 6127603451842322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55351669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27675809 + 27675810.

It is an arithmetic number, because the mean of its divisors is an integer number (27675810).

Almost surely, 2^55351619 is an apocalyptic number.

55351619 is a deficient number, since it is larger than the sum of its proper divisors (1).

55351619 is an equidigital number, since it uses as much as digits as its factorization.

55351619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20250, while the sum is 35.

The square root of 55351619 is about 7439.8668670884. The cubic root of 55351619 is about 381.1039435514.

The spelling of 55351619 in words is "fifty-five million, three hundred fifty-one thousand, six hundred nineteen".