1372226861 has 2 divisors, whose sum is σ = 1372226862. Its totient is φ = 1372226860.

The previous prime is 1372226857. The next prime is 1372226887. The reversal of 1372226861 is 1686222731.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1141764100 + 230462761 = 33790^2 + 15181^2 .

It is an emirp because it is prime and its reverse (1686222731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1372226861 - 2² = 1372226857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1372226561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 686113430 + 686113431.

It is an arithmetic number, because the mean of its divisors is an integer number (686113431).

Almost surely, 2^1372226861 is an apocalyptic number.

It is an amenable number.

1372226861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1372226861 is an equidigital number, since it uses as much as digits as its factorization.

1372226861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 38.

The square root of 1372226861 is about 37043.5805639790. The cubic root of 1372226861 is about 1111.2419777967.

The spelling of 1372226861 in words is "one billion, three hundred seventy-two million, two hundred twenty-six thousand, eight hundred sixty-one".