1011621671 has 2 divisors, whose sum is σ = 1011621672. Its totient is φ = 1011621670.

The previous prime is 1011621649. The next prime is 1011621683. The reversal of 1011621671 is 1761261101.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1011621671 - 2¹⁰ = 1011620647 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1011621671.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011621691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505810835 + 505810836.

It is an arithmetic number, because the mean of its divisors is an integer number (505810836).

Almost surely, 2^1011621671 is an apocalyptic number.

1011621671 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011621671 is an equidigital number, since it uses as much as digits as its factorization.

1011621671 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 26.

The square root of 1011621671 is about 31806.0005502106. Note that the first 3 decimals coincide. The cubic root of 1011621671 is about 1003.8589794553.

Adding to 1011621671 its reverse (1761261101), we get a palindrome (2772882772).

The spelling of 1011621671 in words is "one billion, eleven million, six hundred twenty-one thousand, six hundred seventy-one".