1544550421 has 2 divisors, whose sum is σ = 1544550422. Its totient is φ = 1544550420.

The previous prime is 1544550407. The next prime is 1544550431. The reversal of 1544550421 is 1240554451.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1501175025 + 43375396 = 38745^2 + 6586^2 .

It is a cyclic number.

It is not a de Polignac number, because 1544550421 - 2⁵ = 1544550389 is a prime.

It is a super-2 number, since 2×1544550421² = 4771272006022554482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1544550431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 772275210 + 772275211.

It is an arithmetic number, because the mean of its divisors is an integer number (772275211).

Almost surely, 2^1544550421 is an apocalyptic number.

It is an amenable number.

1544550421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1544550421 is an equidigital number, since it uses as much as digits as its factorization.

1544550421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16000, while the sum is 31.

The square root of 1544550421 is about 39300.7687074948. The cubic root of 1544550421 is about 1155.9366404552.

The spelling of 1544550421 in words is "one billion, five hundred forty-four million, five hundred fifty thousand, four hundred twenty-one".