1277641545 has 48 divisors (see below), whose sum is σ = 2246650560. Its totient is φ = 619150336.

The previous prime is 1277641543. The next prime is 1277641571. The reversal of 1277641545 is 5451467721.

It is not a de Polignac number, because 1277641545 - 2¹ = 1277641543 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1277641497 and 1277641506.

It is not an unprimeable number, because it can be changed into a prime (1277641543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 120634 + ... + 130796.

It is an arithmetic number, because the mean of its divisors is an integer number (46805220).

Almost surely, 2^1277641545 is an apocalyptic number.

1277641545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1277641545 is a deficient number, since it is larger than the sum of its proper divisors (969009015).

1277641545 is a wasteful number, since it uses less digits than its factorization.

1277641545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10234 (or 10217 counting only the distinct ones).

The product of its digits is 235200, while the sum is 42.

The square root of 1277641545 is about 35744.1120326131. The cubic root of 1277641545 is about 1085.0997791678.

The spelling of 1277641545 in words is "one billion, two hundred seventy-seven million, six hundred forty-one thousand, five hundred forty-five".