918639551 has 2 divisors, whose sum is σ = 918639552. Its totient is φ = 918639550.

The previous prime is 918639503. The next prime is 918639599. The reversal of 918639551 is 155936819.

It is a balanced prime because it is at equal distance from previous prime (918639503) and next prime (918639599).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-918639551 is a prime.

It is a super-2 number, since 2×918639551² = 1687797249322963202, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 918639496 and 918639505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (918639751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459319775 + 459319776.

It is an arithmetic number, because the mean of its divisors is an integer number (459319776).

Almost surely, 2^918639551 is an apocalyptic number.

918639551 is a deficient number, since it is larger than the sum of its proper divisors (1).

918639551 is an equidigital number, since it uses as much as digits as its factorization.

918639551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 291600, while the sum is 47.

The square root of 918639551 is about 30309.0671416987. The cubic root of 918639551 is about 972.1091848282.

The spelling of 918639551 in words is "nine hundred eighteen million, six hundred thirty-nine thousand, five hundred fifty-one".