1361778121 has 16 divisors (see below), whose sum is σ = 1503394560. Its totient is φ = 1223223120.

The previous prime is 1361778109. The next prime is 1361778167. The reversal of 1361778121 is 1218771631.

It is a cyclic number.

It is not a de Polignac number, because 1361778121 - 2⁷ = 1361777993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1361778521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 318826 + ... + 323068.

It is an arithmetic number, because the mean of its divisors is an integer number (93962160).

Almost surely, 2^1361778121 is an apocalyptic number.

1361778121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1361778121 is a deficient number, since it is larger than the sum of its proper divisors (141616439).

1361778121 is a wasteful number, since it uses less digits than its factorization.

1361778121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4596.

The product of its digits is 14112, while the sum is 37.

The square root of 1361778121 is about 36902.2779920156. The cubic root of 1361778121 is about 1108.4142931620.

The spelling of 1361778121 in words is "one billion, three hundred sixty-one million, seven hundred seventy-eight thousand, one hundred twenty-one".