1290551623 has 2 divisors, whose sum is σ = 1290551624. Its totient is φ = 1290551622.

The previous prime is 1290551579. The next prime is 1290551657. The reversal of 1290551623 is 3261550921.

It is an a-pointer prime, because the next prime (1290551657) can be obtained adding 1290551623 to its sum of digits (34).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1290551623 - 2¹³ = 1290543431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1290551683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645275811 + 645275812.

It is an arithmetic number, because the mean of its divisors is an integer number (645275812).

Almost surely, 2^1290551623 is an apocalyptic number.

1290551623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1290551623 is an equidigital number, since it uses as much as digits as its factorization.

1290551623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 1290551623 is about 35924.2483985399. The cubic root of 1290551623 is about 1088.7423766527.

The spelling of 1290551623 in words is "one billion, two hundred ninety million, five hundred fifty-one thousand, six hundred twenty-three".