1631552551361 has 4 divisors (see below), whose sum is σ = 1633796778432. Its totient is φ = 1629308324292.

The previous prime is 1631552551351. The next prime is 1631552551457.

1631552551361 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1631552551361 - 2¹⁴ = 1631552534977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1631552551301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1122112445 + ... + 1122113898.

It is an arithmetic number, because the mean of its divisors is an integer number (408449194608).

Almost surely, 2^{1631552551361} is an apocalyptic number.

It is an amenable number.

1631552551361 is a deficient number, since it is larger than the sum of its proper divisors (2244227071).

1631552551361 is an equidigital number, since it uses as much as digits as its factorization.

1631552551361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2244227070.

The product of its digits is 405000, while the sum is 44.

The spelling of 1631552551361 in words is "one trillion, six hundred thirty-one billion, five hundred fifty-two million, five hundred fifty-one thousand, three hundred sixty-one".