1901228213 has 6 divisors (see below), whose sum is σ = 1934002134. Its totient is φ = 1869000584.

The previous prime is 1901228207. The next prime is 1901228237. The reversal of 1901228213 is 3128221091.

It can be written as a sum of positive squares in only one way, i.e., 1416920164 + 484308049 = 37642^2 + 22007^2 .

It is not a de Polignac number, because 1901228213 - 2⁸ = 1901227957 is a prime.

It is a super-2 number, since 2×1901228213² = 7229337435814346738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1901221213) 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, 269606 + ... + 276567.

It is an arithmetic number, because the mean of its divisors is an integer number (322333689).

Almost surely, 2^1901228213 is an apocalyptic number.

It is an amenable number.

1901228213 is a deficient number, since it is larger than the sum of its proper divisors (32773921).

1901228213 is an frugal number, since it uses more digits than its factorization.

1901228213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546291 (or 546232 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1901228213 is about 43603.0757286685. The cubic root of 1901228213 is about 1238.8291525576.

The spelling of 1901228213 in words is "one billion, nine hundred one million, two hundred twenty-eight thousand, two hundred thirteen".