1247061401 has 4 divisors (see below), whose sum is σ = 1320417972. Its totient is φ = 1173704832.

The previous prime is 1247061341. The next prime is 1247061427. The reversal of 1247061401 is 1041607421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1041607421 = 83 ⋅12549487.

It can be written as a sum of positive squares in 2 ways, for example, as 620059801 + 627001600 = 24901^2 + 25040^2 .

It is a cyclic number.

It is not a de Polignac number, because 1247061401 - 2²⁶ = 1179952537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1247061461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36678260 + ... + 36678293.

It is an arithmetic number, because the mean of its divisors is an integer number (330104493).

Almost surely, 2^1247061401 is an apocalyptic number.

It is an amenable number.

1247061401 is a deficient number, since it is larger than the sum of its proper divisors (73356571).

1247061401 is an equidigital number, since it uses as much as digits as its factorization.

1247061401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73356570.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 1247061401 is about 35313.7565404758. The cubic root of 1247061401 is about 1076.3725467133.

Adding to 1247061401 its reverse (1041607421), we get a palindrome (2288668822).

The spelling of 1247061401 in words is "one billion, two hundred forty-seven million, sixty-one thousand, four hundred one".