1210040001 has 6 divisors (see below), whose sum is σ = 1747835570. Its totient is φ = 806693328.

The previous prime is 1210039973. The next prime is 1210040017. The reversal of 1210040001 is 1000400121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 671846400 + 538193601 = 25920^2 + 23199^2 .

It is not a de Polignac number, because 1210040001 - 2⁶ = 1210039937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 134448889 = 1210040001 / (1 + 2 + 1 + 0 + 0 + 4 + 0 + 0 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1210040201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67224436 + ... + 67224453.

Almost surely, 2^1210040001 is an apocalyptic number.

It is an amenable number.

1210040001 is a deficient number, since it is larger than the sum of its proper divisors (537795569).

1210040001 is a wasteful number, since it uses less digits than its factorization.

1210040001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134448895 (or 134448892 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1210040001 is about 34785.6292310488. The cubic root of 1210040001 is about 1065.6139791042.

Adding to 1210040001 its reverse (1000400121), we get a palindrome (2210440122).

The spelling of 1210040001 in words is "one billion, two hundred ten million, forty thousand, one".