1553774149 has 2 divisors, whose sum is σ = 1553774150. Its totient is φ = 1553774148.

The previous prime is 1553774141. The next prime is 1553774221. The reversal of 1553774149 is 9414773551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1440202500 + 113571649 = 37950^2 + 10657^2 .

It is an emirp because it is prime and its reverse (9414773551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1553774149 - 2³ = 1553774141 is a prime.

It is a super-2 number, since 2×1553774149² = 4828428212201348402, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1553774099 and 1553774108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1553774141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 776887074 + 776887075.

It is an arithmetic number, because the mean of its divisors is an integer number (776887075).

Almost surely, 2^1553774149 is an apocalyptic number.

It is an amenable number.

1553774149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1553774149 is an equidigital number, since it uses as much as digits as its factorization.

1553774149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 529200, while the sum is 46.

The square root of 1553774149 is about 39417.9419680937. The cubic root of 1553774149 is about 1158.2330781589.

The spelling of 1553774149 in words is "one billion, five hundred fifty-three million, seven hundred seventy-four thousand, one hundred forty-nine".