71920461 has 4 divisors (see below), whose sum is σ = 95893952. Its totient is φ = 47946972.

The previous prime is 71920447. The next prime is 71920463. The reversal of 71920461 is 16402917.

It is a happy number.

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 not a de Polignac number, because 71920461 - 2⁹ = 71919949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71920463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11986741 + ... + 11986746.

It is an arithmetic number, because the mean of its divisors is an integer number (23973488).

Almost surely, 2^71920461 is an apocalyptic number.

It is an amenable number.

71920461 is a deficient number, since it is larger than the sum of its proper divisors (23973491).

71920461 is a wasteful number, since it uses less digits than its factorization.

71920461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23973490.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 71920461 is about 8480.5931985917. The cubic root of 71920461 is about 415.8635157692.

The spelling of 71920461 in words is "seventy-one million, nine hundred twenty thousand, four hundred sixty-one".