1251223011551 has 8 divisors (see below), whose sum is σ = 1267173811200. Its totient is φ = 1235275025400.

The previous prime is 1251223011517. The next prime is 1251223011583. The reversal of 1251223011551 is 1551103221521.

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-1251223011551 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 (1251223011151) 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, 199070 + ... + 1594388.

It is an arithmetic number, because the mean of its divisors is an integer number (158396726400).

Almost surely, 2^{1251223011551} is an apocalyptic number.

1251223011551 is a deficient number, since it is larger than the sum of its proper divisors (15950799649).

1251223011551 is a wasteful number, since it uses less digits than its factorization.

1251223011551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406749.

The product of its (nonzero) digits is 3000, while the sum is 29.

The spelling of 1251223011551 in words is "one trillion, two hundred fifty-one billion, two hundred twenty-three million, eleven thousand, five hundred fifty-one".