1242520001 has 2 divisors, whose sum is σ = 1242520002. Its totient is φ = 1242520000.

The previous prime is 1242519997. The next prime is 1242520009. The reversal of 1242520001 is 1000252421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1146499600 + 96020401 = 33860^2 + 9799^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242520001 - 2² = 1242519997 is a prime.

It is not a weakly prime, because it can be changed into another prime (1242520009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621260000 + 621260001.

It is an arithmetic number, because the mean of its divisors is an integer number (621260001).

Almost surely, 2^1242520001 is an apocalyptic number.

It is an amenable number.

1242520001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242520001 is an equidigital number, since it uses as much as digits as its factorization.

1242520001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 1242520001 is about 35249.3971721503. The cubic root of 1242520001 is about 1075.0643555487.

Adding to 1242520001 its reverse (1000252421), we get a palindrome (2242772422).

The spelling of 1242520001 in words is "one billion, two hundred forty-two million, five hundred twenty thousand, one".