1901212129 has 2 divisors, whose sum is σ = 1901212130. Its totient is φ = 1901212128.

The previous prime is 1901212121. The next prime is 1901212133. The reversal of 1901212129 is 9212121091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1750585600 + 150626529 = 41840^2 + 12273^2 .

It is an emirp because it is prime and its reverse (9212121091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1901212129 - 2³ = 1901212121 is a prime.

It is a super-2 number, since 2×1901212129² = 7229215118913425282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1901212097 and 1901212106.

It is not a weakly prime, because it can be changed into another prime (1901212121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 950606064 + 950606065.

It is an arithmetic number, because the mean of its divisors is an integer number (950606065).

Almost surely, 2^1901212129 is an apocalyptic number.

It is an amenable number.

1901212129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1901212129 is an equidigital number, since it uses as much as digits as its factorization.

1901212129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 1901212129 is about 43602.8912917481. The cubic root of 1901212129 is about 1238.8256591344.

The spelling of 1901212129 in words is "one billion, nine hundred one million, two hundred twelve thousand, one hundred twenty-nine".