1629149261 has 2 divisors, whose sum is σ = 1629149262. Its totient is φ = 1629149260.

The previous prime is 1629149251. The next prime is 1629149323. The reversal of 1629149261 is 1629419261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 972816100 + 656333161 = 31190^2 + 25619^2 .

It is a cyclic number.

It is not a de Polignac number, because 1629149261 - 2¹⁰ = 1629148237 is a prime.

It is a super-2 number, since 2×1629149261² = 5308254629233692242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1629149251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 814574630 + 814574631.

It is an arithmetic number, because the mean of its divisors is an integer number (814574631).

Almost surely, 2^1629149261 is an apocalyptic number.

It is an amenable number.

1629149261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1629149261 is an equidigital number, since it uses as much as digits as its factorization.

1629149261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The square root of 1629149261 is about 40362.7211793259. The cubic root of 1629149261 is about 1176.6671396749.

The spelling of 1629149261 in words is "one billion, six hundred twenty-nine million, one hundred forty-nine thousand, two hundred sixty-one".