61457911 has 4 divisors (see below), whose sum is σ = 62032392. Its totient is φ = 60883432.

The previous prime is 61457887. The next prime is 61457917. The reversal of 61457911 is 11975416.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61457911 - 2⁹ = 61457399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61457917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287080 + ... + 287293.

It is an arithmetic number, because the mean of its divisors is an integer number (15508098).

Almost surely, 2^61457911 is an apocalyptic number.

61457911 is a deficient number, since it is larger than the sum of its proper divisors (574481).

61457911 is a wasteful number, since it uses less digits than its factorization.

61457911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574480.

The product of its digits is 7560, while the sum is 34.

The square root of 61457911 is about 7839.5096147655. The cubic root of 61457911 is about 394.6322721991.

The spelling of 61457911 in words is "sixty-one million, four hundred fifty-seven thousand, nine hundred eleven".