1549009157 has 2 divisors, whose sum is σ = 1549009158. Its totient is φ = 1549009156.

The previous prime is 1549009087. The next prime is 1549009177. The reversal of 1549009157 is 7519009451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1355270596 + 193738561 = 36814^2 + 13919^2 .

It is a cyclic number.

It is not a de Polignac number, because 1549009157 - 2²² = 1544814853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1549009177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 774504578 + 774504579.

It is an arithmetic number, because the mean of its divisors is an integer number (774504579).

Almost surely, 2^1549009157 is an apocalyptic number.

It is an amenable number.

1549009157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1549009157 is an equidigital number, since it uses as much as digits as its factorization.

1549009157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56700, while the sum is 41.

The square root of 1549009157 is about 39357.4536396856. The cubic root of 1549009157 is about 1157.0478731529.

The spelling of 1549009157 in words is "one billion, five hundred forty-nine million, nine thousand, one hundred fifty-seven".