612461521 has 4 divisors (see below), whose sum is σ = 699956032. Its totient is φ = 524967012.

The previous prime is 612461497. The next prime is 612461537. The reversal of 612461521 is 125164216.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 612461521 - 2⁵ = 612461489 is a prime.

It is a super-2 number, since 2×612461521² = 750218229411266882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 612461521.

It is not an unprimeable number, because it can be changed into a prime (612461581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43747245 + ... + 43747258.

It is an arithmetic number, because the mean of its divisors is an integer number (174989008).

Almost surely, 2^612461521 is an apocalyptic number.

It is an amenable number.

612461521 is a deficient number, since it is larger than the sum of its proper divisors (87494511).

612461521 is an equidigital number, since it uses as much as digits as its factorization.

612461521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87494510.

The product of its digits is 2880, while the sum is 28.

The square root of 612461521 is about 24747.9599361240. The cubic root of 612461521 is about 849.2318416525.

The spelling of 612461521 in words is "six hundred twelve million, four hundred sixty-one thousand, five hundred twenty-one".