1554691091 has 2 divisors, whose sum is σ = 1554691092. Its totient is φ = 1554691090.

The previous prime is 1554691069. The next prime is 1554691129. The reversal of 1554691091 is 1901964551.

It is a weak prime.

It is an emirp because it is prime and its reverse (1901964551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1554691091 - 2⁶ = 1554691027 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1554691291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777345545 + 777345546.

It is an arithmetic number, because the mean of its divisors is an integer number (777345546).

Almost surely, 2^1554691091 is an apocalyptic number.

1554691091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1554691091 is an equidigital number, since it uses as much as digits as its factorization.

1554691091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48600, while the sum is 41.

The square root of 1554691091 is about 39429.5712758838. The cubic root of 1554691091 is about 1158.4608726786.

The spelling of 1554691091 in words is "one billion, five hundred fifty-four million, six hundred ninety-one thousand, ninety-one".