1291251401515 has 8 divisors (see below), whose sum is σ = 1640648839680. Its totient is φ = 972236349312.

The previous prime is 1291251401491. The next prime is 1291251401521. The reversal of 1291251401515 is 5151041521921.

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 1291251401515 - 2²³ = 1291243012907 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7595596395 + ... + 7595596564.

It is an arithmetic number, because the mean of its divisors is an integer number (205081104960).

Almost surely, 2^{1291251401515} is an apocalyptic number.

1291251401515 is a deficient number, since it is larger than the sum of its proper divisors (349397438165).

1291251401515 is a wasteful number, since it uses less digits than its factorization.

1291251401515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15191192981.

The product of its (nonzero) digits is 18000, while the sum is 37.

The spelling of 1291251401515 in words is "one trillion, two hundred ninety-one billion, two hundred fifty-one million, four hundred one thousand, five hundred fifteen".