61722279 has 12 divisors (see below), whose sum is σ = 93847000. Its totient is φ = 38982384.

The previous prime is 61722277. The next prime is 61722281. The reversal of 61722279 is 97222716.

It is an interprime number because it is at equal distance from previous prime (61722277) and next prime (61722281).

It is not a de Polignac number, because 61722279 - 2¹ = 61722277 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 (61722277) 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 11 ways as a sum of consecutive naturals, for example, 180304 + ... + 180645.

Almost surely, 2^61722279 is an apocalyptic number.

61722279 is a deficient number, since it is larger than the sum of its proper divisors (32124721).

61722279 is a wasteful number, since it uses less digits than its factorization.

61722279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360974 (or 360971 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 61722279 is about 7856.3527797573. The cubic root of 61722279 is about 395.1973142271.

It can be divided in two parts, 61722 and 279, that added together give a square (62001 = 249²).

The spelling of 61722279 in words is "sixty-one million, seven hundred twenty-two thousand, two hundred seventy-nine".