612478621 has 2 divisors, whose sum is σ = 612478622. Its totient is φ = 612478620.

The previous prime is 612478583. The next prime is 612478673. The reversal of 612478621 is 126874216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 609398596 + 3080025 = 24686^2 + 1755^2 .

It is a cyclic number.

It is not a de Polignac number, because 612478621 - 2¹⁹ = 611954333 is a prime.

It is a super-2 number, since 2×612478621² = 750260122364123282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (612478721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306239310 + 306239311.

It is an arithmetic number, because the mean of its divisors is an integer number (306239311).

Almost surely, 2^612478621 is an apocalyptic number.

It is an amenable number.

612478621 is a deficient number, since it is larger than the sum of its proper divisors (1).

612478621 is an equidigital number, since it uses as much as digits as its factorization.

612478621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 37.

The square root of 612478621 is about 24748.3054167351. The cubic root of 612478621 is about 849.2397451310.

The spelling of 612478621 in words is "six hundred twelve million, four hundred seventy-eight thousand, six hundred twenty-one".