1621254029 has 2 divisors, whose sum is σ = 1621254030. Its totient is φ = 1621254028.

The previous prime is 1621254001. The next prime is 1621254043. The reversal of 1621254029 is 9204521261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 812136004 + 809118025 = 28498^2 + 28445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1621254029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1621253986 and 1621254004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1621256029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810627014 + 810627015.

It is an arithmetic number, because the mean of its divisors is an integer number (810627015).

Almost surely, 2^1621254029 is an apocalyptic number.

It is an amenable number.

1621254029 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621254029 is an equidigital number, since it uses as much as digits as its factorization.

1621254029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1621254029 is about 40264.7988819018. The cubic root of 1621254029 is about 1174.7632609515.

The spelling of 1621254029 in words is "one billion, six hundred twenty-one million, two hundred fifty-four thousand, twenty-nine".