1371725779 has 2 divisors, whose sum is σ = 1371725780. Its totient is φ = 1371725778.

The previous prime is 1371725741. The next prime is 1371725783. The reversal of 1371725779 is 9775271731.

It is a strong prime.

It is an emirp because it is prime and its reverse (9775271731) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1371725779 is a prime.

It is a super-2 number, since 2×1371725779² = 3763263225546313682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1371425779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 685862889 + 685862890.

It is an arithmetic number, because the mean of its divisors is an integer number (685862890).

Almost surely, 2^1371725779 is an apocalyptic number.

1371725779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1371725779 is an equidigital number, since it uses as much as digits as its factorization.

1371725779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648270, while the sum is 49.

The square root of 1371725779 is about 37036.8165343621. The cubic root of 1371725779 is about 1111.1067010532.

The spelling of 1371725779 in words is "one billion, three hundred seventy-one million, seven hundred twenty-five thousand, seven hundred seventy-nine".