1545251641 has 2 divisors, whose sum is σ = 1545251642. Its totient is φ = 1545251640.

The previous prime is 1545251581. The next prime is 1545251647. The reversal of 1545251641 is 1461525451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1505750416 + 39501225 = 38804^2 + 6285^2 .

It is a cyclic number.

It is not a de Polignac number, because 1545251641 - 2¹³ = 1545243449 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1545251597 and 1545251606.

It is not a weakly prime, because it can be changed into another prime (1545251647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 772625820 + 772625821.

It is an arithmetic number, because the mean of its divisors is an integer number (772625821).

Almost surely, 2^1545251641 is an apocalyptic number.

It is an amenable number.

1545251641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1545251641 is an equidigital number, since it uses as much as digits as its factorization.

1545251641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24000, while the sum is 34.

The square root of 1545251641 is about 39309.6888947242. The cubic root of 1545251641 is about 1156.1115442646. Note that the first 3 decimals are identical.

The spelling of 1545251641 in words is "one billion, five hundred forty-five million, two hundred fifty-one thousand, six hundred forty-one".