1213507501 has 2 divisors, whose sum is σ = 1213507502. Its totient is φ = 1213507500.

The previous prime is 1213507487. The next prime is 1213507507. The reversal of 1213507501 is 1057053121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1213477225 + 30276 = 34835^2 + 174^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213507501 - 2¹⁷ = 1213376429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213507507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606753750 + 606753751.

It is an arithmetic number, because the mean of its divisors is an integer number (606753751).

Almost surely, 2^1213507501 is an apocalyptic number.

It is an amenable number.

1213507501 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213507501 is an equidigital number, since it uses as much as digits as its factorization.

1213507501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1050, while the sum is 25.

The square root of 1213507501 is about 34835.4345602290. The cubic root of 1213507501 is about 1066.6308855945.

The spelling of 1213507501 in words is "one billion, two hundred thirteen million, five hundred seven thousand, five hundred one".