1461727991 has 2 divisors, whose sum is σ = 1461727992. Its totient is φ = 1461727990.

The previous prime is 1461727979. The next prime is 1461727997. The reversal of 1461727991 is 1997271641.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1997271641) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1461727991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1461727997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 730863995 + 730863996.

It is an arithmetic number, because the mean of its divisors is an integer number (730863996).

Almost surely, 2^1461727991 is an apocalyptic number.

1461727991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1461727991 is an equidigital number, since it uses as much as digits as its factorization.

1461727991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 47.

The square root of 1461727991 is about 38232.5514581489. The cubic root of 1461727991 is about 1134.8945779810.

The spelling of 1461727991 in words is "one billion, four hundred sixty-one million, seven hundred twenty-seven thousand, nine hundred ninety-one".