1491892777 has 2 divisors, whose sum is σ = 1491892778. Its totient is φ = 1491892776.

The previous prime is 1491892741. The next prime is 1491892793. The reversal of 1491892777 is 7772981941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1436106816 + 55785961 = 37896^2 + 7469^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1491892777 is a prime.

It is not a weakly prime, because it can be changed into another prime (1491892877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745946388 + 745946389.

It is an arithmetic number, because the mean of its divisors is an integer number (745946389).

Almost surely, 2^1491892777 is an apocalyptic number.

It is an amenable number.

1491892777 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491892777 is an equidigital number, since it uses as much as digits as its factorization.

1491892777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1778112, while the sum is 55.

The square root of 1491892777 is about 38625.0278575951. The cubic root of 1491892777 is about 1142.6481928347.

The spelling of 1491892777 in words is "one billion, four hundred ninety-one million, eight hundred ninety-two thousand, seven hundred seventy-seven".