1551764243 has 2 divisors, whose sum is σ = 1551764244. Its totient is φ = 1551764242.

The previous prime is 1551764237. The next prime is 1551764281. The reversal of 1551764243 is 3424671551.

It is an a-pointer prime, because the next prime (1551764281) can be obtained adding 1551764243 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1551764243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1551764197 and 1551764206.

It is not a weakly prime, because it can be changed into another prime (1551764213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775882121 + 775882122.

It is an arithmetic number, because the mean of its divisors is an integer number (775882122).

Almost surely, 2^1551764243 is an apocalyptic number.

1551764243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551764243 is an equidigital number, since it uses as much as digits as its factorization.

1551764243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 38.

The square root of 1551764243 is about 39392.4389064704. The cubic root of 1551764243 is about 1157.7334465327.

The spelling of 1551764243 in words is "one billion, five hundred fifty-one million, seven hundred sixty-four thousand, two hundred forty-three".