213431504111551 has 8 divisors (see below), whose sum is σ = 246530507423184. Its totient is φ = 182615190683520.

The previous prime is 213431504111549. The next prime is 213431504111593. The reversal of 213431504111551 is 155111405134312.

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 213431504111551 - 2¹ = 213431504111549 is a prime.

It is a super-4 number, since 4×213431504111551⁴ (a number of 58 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213431504111551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213431504115551) 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, 570672470700 + ... + 570672471073.

It is an arithmetic number, because the mean of its divisors is an integer number (30816313427898).

Almost surely, 2^{213431504111551} is an apocalyptic number.

213431504111551 is a deficient number, since it is larger than the sum of its proper divisors (33099003311633).

213431504111551 is a wasteful number, since it uses less digits than its factorization.

213431504111551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1141344941801.

The product of its (nonzero) digits is 36000, while the sum is 37.

Adding to 213431504111551 its reverse (155111405134312), we get a palindrome (368542909245863).

The spelling of 213431504111551 in words is "two hundred thirteen trillion, four hundred thirty-one billion, five hundred four million, one hundred eleven thousand, five hundred fifty-one".