1338121501 has 2 divisors, whose sum is σ = 1338121502. Its totient is φ = 1338121500.

The previous prime is 1338121487. The next prime is 1338121583. The reversal of 1338121501 is 1051218331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1061065476 + 277056025 = 32574^2 + 16645^2 .

It is an emirp because it is prime and its reverse (1051218331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1338121501 - 2⁹ = 1338120989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1338121591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669060750 + 669060751.

It is an arithmetic number, because the mean of its divisors is an integer number (669060751).

Almost surely, 2^1338121501 is an apocalyptic number.

It is an amenable number.

1338121501 is a deficient number, since it is larger than the sum of its proper divisors (1).

1338121501 is an equidigital number, since it uses as much as digits as its factorization.

1338121501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 1338121501 is about 36580.3430957119. The cubic root of 1338121501 is about 1101.9583574239.

Adding to 1338121501 its reverse (1051218331), we get a palindrome (2389339832).

The spelling of 1338121501 in words is "one billion, three hundred thirty-eight million, one hundred twenty-one thousand, five hundred one".