610991477 has 2 divisors, whose sum is σ = 610991478. Its totient is φ = 610991476.

The previous prime is 610991461. The next prime is 610991519. The reversal of 610991477 is 774199016.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 606833956 + 4157521 = 24634^2 + 2039^2 .

It is a cyclic number.

It is not a de Polignac number, because 610991477 - 2⁴ = 610991461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (610991077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305495738 + 305495739.

It is an arithmetic number, because the mean of its divisors is an integer number (305495739).

Almost surely, 2^610991477 is an apocalyptic number.

It is an amenable number.

610991477 is a deficient number, since it is larger than the sum of its proper divisors (1).

610991477 is an equidigital number, since it uses as much as digits as its factorization.

610991477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 610991477 is about 24718.2417861789. The cubic root of 610991477 is about 848.5518488237.

The spelling of 610991477 in words is "six hundred ten million, nine hundred ninety-one thousand, four hundred seventy-seven".