511152661 has 2 divisors, whose sum is σ = 511152662. Its totient is φ = 511152660.

The previous prime is 511152659. The next prime is 511152701. The reversal of 511152661 is 166251115.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 510308100 + 844561 = 22590^2 + 919^2 .

It is a cyclic number.

It is not a de Polignac number, because 511152661 - 2¹ = 511152659 is a prime.

It is a super-2 number, since 2×511152661² = 522554085694761842, which contains 22 as substring.

Together with 511152659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (511152601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255576330 + 255576331.

It is an arithmetic number, because the mean of its divisors is an integer number (255576331).

Almost surely, 2^511152661 is an apocalyptic number.

It is an amenable number.

511152661 is a deficient number, since it is larger than the sum of its proper divisors (1).

511152661 is an equidigital number, since it uses as much as digits as its factorization.

511152661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 28.

The square root of 511152661 is about 22608.6855212770. The cubic root of 511152661 is about 799.5584339233.

The spelling of 511152661 in words is "five hundred eleven million, one hundred fifty-two thousand, six hundred sixty-one".