61951971 has 4 divisors (see below), whose sum is σ = 82602632. Its totient is φ = 41301312.

The previous prime is 61951963. The next prime is 61951979. The reversal of 61951971 is 17915916.

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

It is an interprime number because it is at equal distance from previous prime (61951963) and next prime (61951979).

It is not a de Polignac number, because 61951971 - 2³ = 61951963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61951979) 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, 10325326 + ... + 10325331.

It is an arithmetic number, because the mean of its divisors is an integer number (20650658).

Almost surely, 2^61951971 is an apocalyptic number.

61951971 is a deficient number, since it is larger than the sum of its proper divisors (20650661).

61951971 is a wasteful number, since it uses less digits than its factorization.

61951971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20650660.

The product of its digits is 17010, while the sum is 39.

The square root of 61951971 is about 7870.9574385839. The cubic root of 61951971 is about 395.6869337190.

The spelling of 61951971 in words is "sixty-one million, nine hundred fifty-one thousand, nine hundred seventy-one".