45551999 has 2 divisors, whose sum is σ = 45552000. Its totient is φ = 45551998.

The previous prime is 45551981. The next prime is 45552037. The reversal of 45551999 is 99915554.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 45551999 - 2⁸ = 45551743 is a prime.

It is a super-2 number, since 2×45551999² = 4149969225792002, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45551939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22775999 + 22776000.

It is an arithmetic number, because the mean of its divisors is an integer number (22776000).

Almost surely, 2^45551999 is an apocalyptic number.

45551999 is a deficient number, since it is larger than the sum of its proper divisors (1).

45551999 is an equidigital number, since it uses as much as digits as its factorization.

45551999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 364500, while the sum is 47.

The square root of 45551999 is about 6749.2221033242. Note that the first 3 decimals coincide. The cubic root of 45551999 is about 357.1377954102.

The spelling of 45551999 in words is "forty-five million, five hundred fifty-one thousand, nine hundred ninety-nine".