61951019 has 4 divisors (see below), whose sum is σ = 66716496. Its totient is φ = 57185544.

The previous prime is 61950997. The next prime is 61951033. The reversal of 61951019 is 91015916.

It is a happy number.

61951019 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 61951019 - 2¹² = 61946923 is a prime.

It is a super-2 number, since 2×61951019² = 7675857510276722, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (61951319) 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, 2382719 + ... + 2382744.

It is an arithmetic number, because the mean of its divisors is an integer number (16679124).

Almost surely, 2^61951019 is an apocalyptic number.

61951019 is a deficient number, since it is larger than the sum of its proper divisors (4765477).

61951019 is a wasteful number, since it uses less digits than its factorization.

61951019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4765476.

The product of its (nonzero) digits is 2430, while the sum is 32.

The square root of 61951019 is about 7870.8969628626. The cubic root of 61951019 is about 395.6849069021.

The spelling of 61951019 in words is "sixty-one million, nine hundred fifty-one thousand, nineteen".