1620532651 has 2 divisors, whose sum is σ = 1620532652. Its totient is φ = 1620532650.

The previous prime is 1620532637. The next prime is 1620532663. The reversal of 1620532651 is 1562350261.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1620532651 - 2⁵ = 1620532619 is a prime.

It is a super-2 number, since 2×1620532651² = 5252252145914175602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1620532601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810266325 + 810266326.

It is an arithmetic number, because the mean of its divisors is an integer number (810266326).

Almost surely, 2^1620532651 is an apocalyptic number.

1620532651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620532651 is an equidigital number, since it uses as much as digits as its factorization.

1620532651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 1620532651 is about 40255.8399614267. The cubic root of 1620532651 is about 1174.5889978854.

The spelling of 1620532651 in words is "one billion, six hundred twenty million, five hundred thirty-two thousand, six hundred fifty-one".