1219420901 has 2 divisors, whose sum is σ = 1219420902. Its totient is φ = 1219420900.

The previous prime is 1219420889. The next prime is 1219420919. The reversal of 1219420901 is 1090249121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 852698401 + 366722500 = 29201^2 + 19150^2 .

It is a cyclic number.

It is not a de Polignac number, because 1219420901 - 2¹⁴ = 1219404517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1219420921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609710450 + 609710451.

It is an arithmetic number, because the mean of its divisors is an integer number (609710451).

Almost surely, 2^1219420901 is an apocalyptic number.

It is an amenable number.

1219420901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1219420901 is an equidigital number, since it uses as much as digits as its factorization.

1219420901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 1219420901 is about 34920.2076311124. The cubic root of 1219420901 is about 1068.3606365886.

The spelling of 1219420901 in words is "one billion, two hundred nineteen million, four hundred twenty thousand, nine hundred one".