1319978061 has 6 divisors (see below), whose sum is σ = 1906634990. Its totient is φ = 879985368.

The previous prime is 1319978053. The next prime is 1319978069. The reversal of 1319978061 is 1608799131.

It is an interprime number because it is at equal distance from previous prime (1319978053) and next prime (1319978069).

It can be written as a sum of positive squares in only one way, i.e., 1006475625 + 313502436 = 31725^2 + 17706^2 .

It is not a de Polignac number, because 1319978061 - 2³ = 1319978053 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1319977998 and 1319978016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1319978069) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73332106 + ... + 73332123.

Almost surely, 2^1319978061 is an apocalyptic number.

It is an amenable number.

1319978061 is a deficient number, since it is larger than the sum of its proper divisors (586656929).

1319978061 is a wasteful number, since it uses less digits than its factorization.

1319978061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146664235 (or 146664232 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 1319978061 is about 36331.5023223648. The cubic root of 1319978061 is about 1096.9552331210.

The spelling of 1319978061 in words is "one billion, three hundred nineteen million, nine hundred seventy-eight thousand, sixty-one".