1387062661 has 4 divisors (see below), whose sum is σ = 1387716300. Its totient is φ = 1386409024.

The previous prime is 1387062647. The next prime is 1387062671. The reversal of 1387062661 is 1662607831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1662607831 = 23 ⋅72287297.

It can be written as a sum of positive squares in 2 ways, for example, as 685130625 + 701932036 = 26175^2 + 26494^2 .

It is a cyclic number.

It is not a de Polignac number, because 1387062661 - 2¹¹ = 1387060613 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387062601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 323626 + ... + 327883.

It is an arithmetic number, because the mean of its divisors is an integer number (346929075).

Almost surely, 2^1387062661 is an apocalyptic number.

It is an amenable number.

1387062661 is a deficient number, since it is larger than the sum of its proper divisors (653639).

1387062661 is an equidigital number, since it uses as much as digits as its factorization.

1387062661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653638.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 1387062661 is about 37243.2901473541. The cubic root of 1387062661 is about 1115.2323541317.

The spelling of 1387062661 in words is "one billion, three hundred eighty-seven million, sixty-two thousand, six hundred sixty-one".