1549449431 has 2 divisors, whose sum is σ = 1549449432. Its totient is φ = 1549449430.

The previous prime is 1549449371. The next prime is 1549449463. The reversal of 1549449431 is 1349449451.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1549449431 - 2¹⁴ = 1549433047 is a prime.

It is a super-2 number, since 2×1549449431² = 4801587078452447522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1549449931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 774724715 + 774724716.

It is an arithmetic number, because the mean of its divisors is an integer number (774724716).

Almost surely, 2^1549449431 is an apocalyptic number.

1549449431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1549449431 is an equidigital number, since it uses as much as digits as its factorization.

1549449431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 44.

The square root of 1549449431 is about 39363.0465157361. The cubic root of 1549449431 is about 1157.1574851236.

The spelling of 1549449431 in words is "one billion, five hundred forty-nine million, four hundred forty-nine thousand, four hundred thirty-one".