612188491 has 2 divisors, whose sum is σ = 612188492. Its totient is φ = 612188490.

The previous prime is 612188453. The next prime is 612188501. The reversal of 612188491 is 194881216.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 612188491 - 2¹³ = 612180299 is a prime.

It is not a weakly prime, because it can be changed into another prime (612182491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306094245 + 306094246.

It is an arithmetic number, because the mean of its divisors is an integer number (306094246).

Almost surely, 2^612188491 is an apocalyptic number.

612188491 is a deficient number, since it is larger than the sum of its proper divisors (1).

612188491 is an equidigital number, since it uses as much as digits as its factorization.

612188491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 40.

The square root of 612188491 is about 24742.4431089575. The cubic root of 612188491 is about 849.1056295151.

The spelling of 612188491 in words is "six hundred twelve million, one hundred eighty-eight thousand, four hundred ninety-one".