1219155401 has 2 divisors, whose sum is σ = 1219155402. Its totient is φ = 1219155400.

The previous prime is 1219155373. The next prime is 1219155521. The reversal of 1219155401 is 1045519121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 981255625 + 237899776 = 31325^2 + 15424^2 .

It is a cyclic number.

It is not a de Polignac number, because 1219155401 - 2¹⁴ = 1219139017 is a prime.

It is not a weakly prime, because it can be changed into another prime (1219155001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609577700 + 609577701.

It is an arithmetic number, because the mean of its divisors is an integer number (609577701).

Almost surely, 2^1219155401 is an apocalyptic number.

It is an amenable number.

1219155401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1219155401 is an equidigital number, since it uses as much as digits as its factorization.

1219155401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 29.

The square root of 1219155401 is about 34916.4059003787. The cubic root of 1219155401 is about 1068.2830942248.

The spelling of 1219155401 in words is "one billion, two hundred nineteen million, one hundred fifty-five thousand, four hundred one".