1551513443531 has 2 divisors, whose sum is σ = 1551513443532. Its totient is φ = 1551513443530.

The previous prime is 1551513443461. The next prime is 1551513443533. The reversal of 1551513443531 is 1353443151551.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1551513443531 is a prime.

It is a super-2 number, since 2×1551513443531² (a number of 25 digits) contains 22 as substring.

Together with 1551513443533, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1551513443533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775756721765 + 775756721766.

It is an arithmetic number, because the mean of its divisors is an integer number (775756721766).

Almost surely, 2^{1551513443531} is an apocalyptic number.

1551513443531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551513443531 is an equidigital number, since it uses as much as digits as its factorization.

1551513443531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 270000, while the sum is 41.

The spelling of 1551513443531 in words is "one trillion, five hundred fifty-one billion, five hundred thirteen million, four hundred forty-three thousand, five hundred thirty-one".