612542881 has 16 divisors (see below), whose sum is σ = 668842560. Its totient is φ = 558964800.

The previous prime is 612542873. The next prime is 612542891. The reversal of 612542881 is 188245216.

It is not a de Polignac number, because 612542881 - 2³ = 612542873 is a prime.

It is a super-2 number, since 2×612542881² = 750417562127560322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a self number, because there is not a number n which added to its sum of digits gives 612542881.

It is not an unprimeable number, because it can be changed into a prime (612542891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66690 + ... + 75316.

It is an arithmetic number, because the mean of its divisors is an integer number (41802660).

Almost surely, 2^612542881 is an apocalyptic number.

It is an amenable number.

612542881 is a deficient number, since it is larger than the sum of its proper divisors (56299679).

612542881 is a wasteful number, since it uses less digits than its factorization.

612542881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8784.

The product of its digits is 30720, while the sum is 37.

The square root of 612542881 is about 24749.6036533921. The cubic root of 612542881 is about 849.2694442561.

The spelling of 612542881 in words is "six hundred twelve million, five hundred forty-two thousand, eight hundred eighty-one".