1623609901 has 2 divisors, whose sum is σ = 1623609902. Its totient is φ = 1623609900.

The previous prime is 1623609853. The next prime is 1623609917. The reversal of 1623609901 is 1099063261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 894069801 + 729540100 = 29901^2 + 27010^2 .

It is a cyclic number.

It is not a de Polignac number, because 1623609901 - 2¹³ = 1623601709 is a prime.

It is a super-2 number, since 2×1623609901² = 5272218221250459602, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1623609931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811804950 + 811804951.

It is an arithmetic number, because the mean of its divisors is an integer number (811804951).

Almost surely, 2^1623609901 is an apocalyptic number.

It is an amenable number.

1623609901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1623609901 is an equidigital number, since it uses as much as digits as its factorization.

1623609901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 1623609901 is about 40294.0429964530. The cubic root of 1623609901 is about 1175.3320084271.

It can be divided in two parts, 1623 and 609901, that added together give a square (611524 = 782²).

The spelling of 1623609901 in words is "one billion, six hundred twenty-three million, six hundred nine thousand, nine hundred one".