1213555551401 has 8 divisors (see below), whose sum is σ = 1256487115008. Its totient is φ = 1170860526000.

The previous prime is 1213555551353. The next prime is 1213555551431. The reversal of 1213555551401 is 1041555553121.

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-1213555551401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213555551431) 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, 59124110 + ... + 59144631.

It is an arithmetic number, because the mean of its divisors is an integer number (157060889376).

Almost surely, 2^{1213555551401} is an apocalyptic number.

It is an amenable number.

1213555551401 is a deficient number, since it is larger than the sum of its proper divisors (42931563607).

1213555551401 is a wasteful number, since it uses less digits than its factorization.

1213555551401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118269103.

The product of its (nonzero) digits is 75000, while the sum is 38.

The spelling of 1213555551401 in words is "one trillion, two hundred thirteen billion, five hundred fifty-five million, five hundred fifty-one thousand, four hundred one".