1631551361 has 8 divisors (see below), whose sum is σ = 1783989984. Its totient is φ = 1479798720.

The previous prime is 1631551351. The next prime is 1631551429.

1631551361 is nontrivially palindromic in base 10.

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 1631551361 - 2¹⁸ = 1631289217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1631551321) 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, 166511 + ... + 176036.

It is an arithmetic number, because the mean of its divisors is an integer number (222998748).

Almost surely, 2^1631551361 is an apocalyptic number.

1631551361 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1631551361 is a deficient number, since it is larger than the sum of its proper divisors (152438623).

1631551361 is a wasteful number, since it uses less digits than its factorization.

1631551361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342991.

The product of its digits is 8100, while the sum is 32.

The square root of 1631551361 is about 40392.4666367381. The cubic root of 1631551361 is about 1177.2451681745.

It can be divided in two parts, 16315 and 51361, that added together give a palindrome (67676).

The spelling of 1631551361 in words is "one billion, six hundred thirty-one million, five hundred fifty-one thousand, three hundred sixty-one".