1623132991 has 2 divisors, whose sum is σ = 1623132992.
Its totient is φ = 1623132990.
The previous prime is 1623132859. The next prime is 1623133009. The reversal of 1623132991 is 1992313261.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 1623132991 - 215 = 1623100223 is a prime.
It is a self number, because there is not a number n which added to its sum of digits gives 1623132991.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (1623132691) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811566495 + 811566496.
It is an arithmetic number, because the mean of its divisors is an integer number (811566496).
Almost surely, 21623132991 is an apocalyptic number.
1623132991 is a deficient number, since it is larger than the sum of its proper divisors (1).
1623132991 is an equidigital number, since it uses as much as digits as its factorization.
1623132991 is an evil number, because the sum of its binary digits is even.
The product of its digits is 17496, while the sum is 37.
The square root of 1623132991 is about 40288.1246895410.
The cubic root of 1623132991 is about 1175.2169186963.
The spelling of 1623132991 in words is "one billion, six hundred twenty-three million, one hundred thirty-two thousand, nine hundred ninety-one".