1387282261 has 8 divisors (see below), whose sum is σ = 1414210104. Its totient is φ = 1360382400.

The previous prime is 1387282243. The next prime is 1387282279. The reversal of 1387282261 is 1622827831.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1387282243) and next prime (1387282279).

It can be written as a sum of positive squares in 4 ways, for example, as 734735236 + 652547025 = 27106^2 + 25545^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1387282261 - 2¹⁷ = 1387151189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387282201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112711 + ... + 124411.

It is an arithmetic number, because the mean of its divisors is an integer number (176776263).

Almost surely, 2^1387282261 is an apocalyptic number.

It is an amenable number.

1387282261 is a deficient number, since it is larger than the sum of its proper divisors (26927843).

1387282261 is a wasteful number, since it uses less digits than its factorization.

1387282261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13991.

The product of its digits is 64512, while the sum is 40.

The square root of 1387282261 is about 37246.2382127377. The cubic root of 1387282261 is about 1115.2912056190.

The spelling of 1387282261 in words is "one billion, three hundred eighty-seven million, two hundred eighty-two thousand, two hundred sixty-one".