1621547041 has 2 divisors, whose sum is σ = 1621547042. Its totient is φ = 1621547040.

The previous prime is 1621546961. The next prime is 1621547069. The reversal of 1621547041 is 1407451261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1538208400 + 83338641 = 39220^2 + 9129^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1621547041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1621546994 and 1621547012.

It is not a weakly prime, because it can be changed into another prime (1621545041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810773520 + 810773521.

It is an arithmetic number, because the mean of its divisors is an integer number (810773521).

Almost surely, 2^1621547041 is an apocalyptic number.

It is an amenable number.

1621547041 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621547041 is an equidigital number, since it uses as much as digits as its factorization.

1621547041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 1621547041 is about 40268.4372803316. The cubic root of 1621547041 is about 1174.8340290095.

The spelling of 1621547041 in words is "one billion, six hundred twenty-one million, five hundred forty-seven thousand, forty-one".