611542121 has 4 divisors (see below), whose sum is σ = 611933952. Its totient is φ = 611150292.

The previous prime is 611542109. The next prime is 611542159. The reversal of 611542121 is 121245116.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-611542121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (611547121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193565 + ... + 196698.

It is an arithmetic number, because the mean of its divisors is an integer number (152983488).

Almost surely, 2^611542121 is an apocalyptic number.

It is an amenable number.

611542121 is a deficient number, since it is larger than the sum of its proper divisors (391831).

611542121 is a wasteful number, since it uses less digits than its factorization.

611542121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391830.

The product of its digits is 480, while the sum is 23.

The square root of 611542121 is about 24729.3776913209. The cubic root of 611542121 is about 848.8066858143.

Adding to 611542121 its reverse (121245116), we get a palindrome (732787237).

The spelling of 611542121 in words is "six hundred eleven million, five hundred forty-two thousand, one hundred twenty-one".