555245991 has 48 divisors (see below), whose sum is σ = 853632000. Its totient is φ = 347276160.

The previous prime is 555245963. The next prime is 555246001. The reversal of 555245991 is 199542555.

555245991 is a `hidden beast` number, since 5 + 5 + 52 + 4 + 599 + 1 = 666.

It is not a de Polignac number, because 555245991 - 2⁶ = 555245927 is a prime.

It is a super-2 number, since 2×555245991² = 616596221043144162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (555245941) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1464840 + ... + 1465218.

It is an arithmetic number, because the mean of its divisors is an integer number (17784000).

Almost surely, 2^555245991 is an apocalyptic number.

555245991 is a deficient number, since it is larger than the sum of its proper divisors (298386009).

555245991 is a wasteful number, since it uses less digits than its factorization.

555245991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564 (or 561 counting only the distinct ones).

The product of its digits is 405000, while the sum is 45.

The square root of 555245991 is about 23563.6582686136. The cubic root of 555245991 is about 821.9179727053.

The spelling of 555245991 in words is "five hundred fifty-five million, two hundred forty-five thousand, nine hundred ninety-one".