1621312547 has 2 divisors, whose sum is σ = 1621312548. Its totient is φ = 1621312546.

The previous prime is 1621312489. The next prime is 1621312601. The reversal of 1621312547 is 7452131261.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1621312547 - 2¹⁶ = 1621247011 is a prime.

It is not a weakly prime, because it can be changed into another prime (1621312447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810656273 + 810656274.

It is an arithmetic number, because the mean of its divisors is an integer number (810656274).

Almost surely, 2^1621312547 is an apocalyptic number.

1621312547 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621312547 is an equidigital number, since it uses as much as digits as its factorization.

1621312547 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 32.

The square root of 1621312547 is about 40265.5255398461. The cubic root of 1621312547 is about 1174.7773948602. Note that the first 3 decimals are identical.

It can be divided in two parts, 162131254 and 7, that added together give a palindrome (162131261).

The spelling of 1621312547 in words is "one billion, six hundred twenty-one million, three hundred twelve thousand, five hundred forty-seven".