1361720631 has 8 divisors (see below), whose sum is σ = 1815908080. Its totient is φ = 907673472.

The previous prime is 1361720617. The next prime is 1361720651. The reversal of 1361720631 is 1360271631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1361720631 - 2⁵ = 1361720599 is a prime.

It is a super-2 number, since 2×1361720631² = 3708566153782076322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1361720651) 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, 9826 + ... + 53103.

It is an arithmetic number, because the mean of its divisors is an integer number (226988510).

Almost surely, 2^1361720631 is an apocalyptic number.

1361720631 is a deficient number, since it is larger than the sum of its proper divisors (454187449).

1361720631 is an equidigital number, since it uses as much as digits as its factorization.

1361720631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70145.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 1361720631 is about 36901.4990345921. The cubic root of 1361720631 is about 1108.3986950178.

The spelling of 1361720631 in words is "one billion, three hundred sixty-one million, seven hundred twenty thousand, six hundred thirty-one".