1545421 has 2 divisors, whose sum is σ = 1545422. Its totient is φ = 1545420.

The previous prime is 1545391. The next prime is 1545431. The reversal of 1545421 is 1245451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1179396 + 366025 = 1086^2 + 605^2 .

It is an emirp because it is prime and its reverse (1245451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1545421 - 2⁵ = 1545389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1545392 and 1545401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1545431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 772710 + 772711.

It is an arithmetic number, because the mean of its divisors is an integer number (772711).

2^1545421 is an apocalyptic number.

It is an amenable number.

1545421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1545421 is an equidigital number, since it uses as much as digits as its factorization.

1545421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 800, while the sum is 22.

The square root of 1545421 is about 1243.1496289667. The cubic root of 1545421 is about 115.6153779186.

The spelling of 1545421 in words is "one million, five hundred forty-five thousand, four hundred twenty-one".