1621651067 has 2 divisors, whose sum is σ = 1621651068. Its totient is φ = 1621651066.

The previous prime is 1621651039. The next prime is 1621651069. The reversal of 1621651067 is 7601561261.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1621651067 - 2¹⁴ = 1621634683 is a prime.

Together with 1621651069, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1621651069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810825533 + 810825534.

It is an arithmetic number, because the mean of its divisors is an integer number (810825534).

Almost surely, 2^1621651067 is an apocalyptic number.

1621651067 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621651067 is an equidigital number, since it uses as much as digits as its factorization.

1621651067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 1621651067 is about 40269.7289163957. The cubic root of 1621651067 is about 1174.8591512473.

The spelling of 1621651067 in words is "one billion, six hundred twenty-one million, six hundred fifty-one thousand, sixty-seven".