920121511 has 2 divisors, whose sum is σ = 920121512. Its totient is φ = 920121510.

The previous prime is 920121487. The next prime is 920121523. The reversal of 920121511 is 115121029.

It is a strong prime.

It is an emirp because it is prime and its reverse (115121029) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 920121511 - 2⁵ = 920121479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (920121551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460060755 + 460060756.

It is an arithmetic number, because the mean of its divisors is an integer number (460060756).

Almost surely, 2^920121511 is an apocalyptic number.

920121511 is a deficient number, since it is larger than the sum of its proper divisors (1).

920121511 is an equidigital number, since it uses as much as digits as its factorization.

920121511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 22.

The square root of 920121511 is about 30333.5047595889. The cubic root of 920121511 is about 972.6316432617.

The spelling of 920121511 in words is "nine hundred twenty million, one hundred twenty-one thousand, five hundred eleven".