1320251187 has 16 divisors (see below), whose sum is σ = 1841508000. Its totient is φ = 840263424.

The previous prime is 1320251183. The next prime is 1320251249. The reversal of 1320251187 is 7811520231.

It is not a de Polignac number, because 1320251187 - 2² = 1320251183 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1320251183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77512 + ... + 92997.

It is an arithmetic number, because the mean of its divisors is an integer number (115094250).

Almost surely, 2^1320251187 is an apocalyptic number.

1320251187 is a deficient number, since it is larger than the sum of its proper divisors (521256813).

1320251187 is a wasteful number, since it uses less digits than its factorization.

1320251187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170630.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 1320251187 is about 36335.2609320478. The cubic root of 1320251187 is about 1097.0308874927.

The spelling of 1320251187 in words is "one billion, three hundred twenty million, two hundred fifty-one thousand, one hundred eighty-seven".