61006921 has 4 divisors (see below), whose sum is σ = 61166592. Its totient is φ = 60847252.

The previous prime is 61006873. The next prime is 61006927. The reversal of 61006921 is 12960016.

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 not a de Polignac number, because 61006921 - 2⁷ = 61006793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61006927) 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, 79261 + ... + 80026.

It is an arithmetic number, because the mean of its divisors is an integer number (15291648).

Almost surely, 2^61006921 is an apocalyptic number.

It is an amenable number.

61006921 is a deficient number, since it is larger than the sum of its proper divisors (159671).

61006921 is a wasteful number, since it uses less digits than its factorization.

61006921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159670.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 61006921 is about 7810.6927349628. The cubic root of 61006921 is about 393.6646054505.

Adding to 61006921 its reverse (12960016), we get a palindrome (73966937).

The spelling of 61006921 in words is "sixty-one million, six thousand, nine hundred twenty-one".