1555698941 has 2 divisors, whose sum is σ = 1555698942. Its totient is φ = 1555698940.

The previous prime is 1555698931. The next prime is 1555698959. The reversal of 1555698941 is 1498965551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1523731225 + 31967716 = 39035^2 + 5654^2 .

It is an emirp because it is prime and its reverse (1498965551) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1555698941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1555698931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777849470 + 777849471.

It is an arithmetic number, because the mean of its divisors is an integer number (777849471).

Almost surely, 2^1555698941 is an apocalyptic number.

It is an amenable number.

1555698941 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555698941 is an equidigital number, since it uses as much as digits as its factorization.

1555698941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944000, while the sum is 53.

The square root of 1555698941 is about 39442.3495877211. The cubic root of 1555698941 is about 1158.7111480321.

The spelling of 1555698941 in words is "one billion, five hundred fifty-five million, six hundred ninety-eight thousand, nine hundred forty-one".