1554994117 has 2 divisors, whose sum is σ = 1554994118. Its totient is φ = 1554994116.

The previous prime is 1554994039. The next prime is 1554994121. The reversal of 1554994117 is 7114994551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 791521956 + 763472161 = 28134^2 + 27631^2 .

It is a cyclic number.

It is not a de Polignac number, because 1554994117 - 2²³ = 1546605509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1554994187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777497058 + 777497059.

It is an arithmetic number, because the mean of its divisors is an integer number (777497059).

Almost surely, 2^1554994117 is an apocalyptic number.

It is an amenable number.

1554994117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1554994117 is an equidigital number, since it uses as much as digits as its factorization.

1554994117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 46.

The square root of 1554994117 is about 39433.4137122314. The cubic root of 1554994117 is about 1158.5361332800.

The spelling of 1554994117 in words is "one billion, five hundred fifty-four million, nine hundred ninety-four thousand, one hundred seventeen".