1264000251391 has 8 divisors (see below), whose sum is σ = 1287964934784. Its totient is φ = 1240039850400.

The previous prime is 1264000251389. The next prime is 1264000251413. The reversal of 1264000251391 is 1931520004621.

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 1264000251391 - 2¹ = 1264000251389 is a prime.

It is a super-2 number, since 2×1264000251391² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264000251301) 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, 471535 + ... + 1658416.

It is an arithmetic number, because the mean of its divisors is an integer number (160995616848).

Almost surely, 2^{1264000251391} is an apocalyptic number.

1264000251391 is a deficient number, since it is larger than the sum of its proper divisors (23964683393).

1264000251391 is a wasteful number, since it uses less digits than its factorization.

1264000251391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2141201.

The product of its (nonzero) digits is 12960, while the sum is 34.

The spelling of 1264000251391 in words is "one trillion, two hundred sixty-four billion, two hundred fifty-one thousand, three hundred ninety-one".