1387165551 has 8 divisors (see below), whose sum is σ = 1849925424. Its totient is φ = 924591360.

The previous prime is 1387165537. The next prime is 1387165597. The reversal of 1387165551 is 1555617831.

It is a happy number.

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

It is not a de Polignac number, because 1387165551 - 2²³ = 1378776943 is a prime.

It is a super-2 number, since 2×1387165551² = 3848456531762267202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387165511) 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, 27936 + ... + 59621.

It is an arithmetic number, because the mean of its divisors is an integer number (231240678).

Almost surely, 2^1387165551 is an apocalyptic number.

1387165551 is a deficient number, since it is larger than the sum of its proper divisors (462759873).

1387165551 is an equidigital number, since it uses as much as digits as its factorization.

1387165551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92841.

The product of its digits is 126000, while the sum is 42.

The square root of 1387165551 is about 37244.6714443825. The cubic root of 1387165551 is about 1115.2599288099.

The spelling of 1387165551 in words is "one billion, three hundred eighty-seven million, one hundred sixty-five thousand, five hundred fifty-one".