1351247187 has 18 divisors (see below), whose sum is σ = 1903181868. Its totient is φ = 852655248.

The previous prime is 1351247143. The next prime is 1351247197. The reversal of 1351247187 is 7817421531.

It is a happy number.

It is not a de Polignac number, because 1351247187 - 2⁶ = 1351247123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1351247197) 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 17 ways as a sum of consecutive naturals, for example, 1209153 + ... + 1210269.

It is an arithmetic number, because the mean of its divisors is an integer number (105732326).

Almost surely, 2^1351247187 is an apocalyptic number.

1351247187 is a deficient number, since it is larger than the sum of its proper divisors (551934681).

1351247187 is an frugal number, since it uses more digits than its factorization.

1351247187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2275 (or 1139 counting only the distinct ones).

The product of its digits is 47040, while the sum is 39.

The square root of 1351247187 is about 36759.3142890343. The cubic root of 1351247187 is about 1105.5496912217.

It can be divided in two parts, 135124 and 7187, that added together give a triangular number (142311 = T₅₃₃).

The spelling of 1351247187 in words is "one billion, three hundred fifty-one million, two hundred forty-seven thousand, one hundred eighty-seven".