1301387551 has 4 divisors (see below), whose sum is σ = 1301482672. Its totient is φ = 1301292432.

The previous prime is 1301387537. The next prime is 1301387579. The reversal of 1301387551 is 1557831031.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1557831031 = 16963 ⋅91837.

It is a cyclic number.

It is not a de Polignac number, because 1301387551 - 2⁹ = 1301387039 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 (1301387531) 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, 22710 + ... + 55843.

It is an arithmetic number, because the mean of its divisors is an integer number (325370668).

Almost surely, 2^1301387551 is an apocalyptic number.

1301387551 is a deficient number, since it is larger than the sum of its proper divisors (95121).

1301387551 is an equidigital number, since it uses as much as digits as its factorization.

1301387551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95120.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 1301387551 is about 36074.7494932397. The cubic root of 1301387551 is about 1091.7810432718.

The spelling of 1301387551 in words is "one billion, three hundred one million, three hundred eighty-seven thousand, five hundred fifty-one".