1277130465 has 72 divisors (see below), whose sum is σ = 2437256952. Its totient is φ = 618209280.

The previous prime is 1277130427. The next prime is 1277130497. The reversal of 1277130465 is 5640317721.

It is a happy number.

1277130465 is a `hidden beast` number, since 127 + 71 + 3 + 0 + 465 = 666.

It can be written as a sum of positive squares in 12 ways, for example, as 780420096 + 496710369 = 27936^2 + 22287^2 .

It is not a de Polignac number, because 1277130465 - 2¹² = 1277126369 is a prime.

It is a super-2 number, since 2×1277130465² = 3262124449262232450, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 462529 + ... + 465281.

It is an arithmetic number, because the mean of its divisors is an integer number (33850791).

Almost surely, 2^1277130465 is an apocalyptic number.

1277130465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1277130465 is a deficient number, since it is larger than the sum of its proper divisors (1160126487).

1277130465 is a wasteful number, since it uses less digits than its factorization.

1277130465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2851 (or 2835 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 1277130465 is about 35736.9621680411. The cubic root of 1277130465 is about 1084.9550732811.

The spelling of 1277130465 in words is "one billion, two hundred seventy-seven million, one hundred thirty thousand, four hundred sixty-five".