55136989 has 2 divisors, whose sum is σ = 55136990. Its totient is φ = 55136988.

The previous prime is 55136953. The next prime is 55136999. The reversal of 55136989 is 98963155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30802500 + 24334489 = 5550^2 + 4933^2 .

It is a cyclic number.

It is not a de Polignac number, because 55136989 - 2¹⁵ = 55104221 is a prime.

It is a super-2 number, since 2×55136989² = 6080175111972242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55136929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27568494 + 27568495.

It is an arithmetic number, because the mean of its divisors is an integer number (27568495).

Almost surely, 2^55136989 is an apocalyptic number.

It is an amenable number.

55136989 is a deficient number, since it is larger than the sum of its proper divisors (1).

55136989 is an equidigital number, since it uses as much as digits as its factorization.

55136989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 291600, while the sum is 46.

The square root of 55136989 is about 7425.4285398218. The cubic root of 55136989 is about 380.6107192458.

The spelling of 55136989 in words is "fifty-five million, one hundred thirty-six thousand, nine hundred eighty-nine".