1623634541 has 2 divisors, whose sum is σ = 1623634542. Its totient is φ = 1623634540.

The previous prime is 1623634451. The next prime is 1623634543. The reversal of 1623634541 is 1454363261.

Together with previous prime (1623634451) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 986274025 + 637360516 = 31405^2 + 25246^2 .

It is a cyclic number.

It is not a de Polignac number, because 1623634541 - 2¹⁸ = 1623372397 is a prime.

Together with 1623634543, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1623634543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811817270 + 811817271.

It is an arithmetic number, because the mean of its divisors is an integer number (811817271).

Almost surely, 2^1623634541 is an apocalyptic number.

It is an amenable number.

1623634541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1623634541 is an equidigital number, since it uses as much as digits as its factorization.

1623634541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 35.

The square root of 1623634541 is about 40294.3487476842. The cubic root of 1623634541 is about 1175.3379540331.

The spelling of 1623634541 in words is "one billion, six hundred twenty-three million, six hundred thirty-four thousand, five hundred forty-one".