1651651601 has 2 divisors, whose sum is σ = 1651651602. Its totient is φ = 1651651600.

The previous prime is 1651651579. The next prime is 1651651691. The reversal of 1651651601 is 1061561561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 985960000 + 665691601 = 31400^2 + 25801^2 .

It is a cyclic number.

It is not a de Polignac number, because 1651651601 - 2¹⁴ = 1651635217 is a prime.

It is a super-2 number, since 2×1651651601² = 5455906022171726402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1651651691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 825825800 + 825825801.

It is an arithmetic number, because the mean of its divisors is an integer number (825825801).

Almost surely, 2^1651651601 is an apocalyptic number.

It is an amenable number.

1651651601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1651651601 is an equidigital number, since it uses as much as digits as its factorization.

1651651601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 1651651601 is about 40640.5167413014. The cubic root of 1651651601 is about 1182.0598897643.

The spelling of 1651651601 in words is "one billion, six hundred fifty-one million, six hundred fifty-one thousand, six hundred one".