1248787955921 has 8 divisors (see below), whose sum is σ = 1362530484000. Its totient is φ = 1135081486240.

The previous prime is 1248787955893. The next prime is 1248787955939. The reversal of 1248787955921 is 1295597878421.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1248787955921 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1248787925921) 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, 8942156 + ... + 9080733.

It is an arithmetic number, because the mean of its divisors is an integer number (170316310500).

Almost surely, 2^{1248787955921} is an apocalyptic number.

1248787955921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1248787955921 is a deficient number, since it is larger than the sum of its proper divisors (113742528079).

1248787955921 is a wasteful number, since it uses less digits than its factorization.

1248787955921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18029199.

The product of its digits is 101606400, while the sum is 68.

The spelling of 1248787955921 in words is "one trillion, two hundred forty-eight billion, seven hundred eighty-seven million, nine hundred fifty-five thousand, nine hundred twenty-one".