1238542651 has 2 divisors, whose sum is σ = 1238542652. Its totient is φ = 1238542650.

The previous prime is 1238542649. The next prime is 1238542727. The reversal of 1238542651 is 1562458321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1238542651 - 2¹ = 1238542649 is a prime.

It is a super-2 number, since 2×1238542651² = 3067975796692215602, which contains 22 as substring.

Together with 1238542649, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1238542651.

It is not a weakly prime, because it can be changed into another prime (1238542051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619271325 + 619271326.

It is an arithmetic number, because the mean of its divisors is an integer number (619271326).

Almost surely, 2^1238542651 is an apocalyptic number.

1238542651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1238542651 is an equidigital number, since it uses as much as digits as its factorization.

1238542651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57600, while the sum is 37.

The square root of 1238542651 is about 35192.9346744485. The cubic root of 1238542651 is about 1073.9160231852.

The spelling of 1238542651 in words is "one billion, two hundred thirty-eight million, five hundred forty-two thousand, six hundred fifty-one".