1238861501 has 2 divisors, whose sum is σ = 1238861502. Its totient is φ = 1238861500.

The previous prime is 1238861497. The next prime is 1238861563. The reversal of 1238861501 is 1051688321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1237210276 + 1651225 = 35174^2 + 1285^2 .

It is an emirp because it is prime and its reverse (1051688321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1238861501 - 2² = 1238861497 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1238861101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619430750 + 619430751.

It is an arithmetic number, because the mean of its divisors is an integer number (619430751).

Almost surely, 2^1238861501 is an apocalyptic number.

It is an amenable number.

1238861501 is a deficient number, since it is larger than the sum of its proper divisors (1).

1238861501 is an equidigital number, since it uses as much as digits as its factorization.

1238861501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 1238861501 is about 35197.4644115169. The cubic root of 1238861501 is about 1074.0081714704.

The spelling of 1238861501 in words is "one billion, two hundred thirty-eight million, eight hundred sixty-one thousand, five hundred one".