61947421 has 4 divisors (see below), whose sum is σ = 62066844. Its totient is φ = 61828000.

The previous prime is 61947409. The next prime is 61947437. The reversal of 61947421 is 12474916.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20602521 + 41344900 = 4539^2 + 6430^2 .

It is a cyclic number.

It is not a de Polignac number, because 61947421 - 2²¹ = 59850269 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 (61947461) 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, 58930 + ... + 59971.

It is an arithmetic number, because the mean of its divisors is an integer number (15516711).

Almost surely, 2^61947421 is an apocalyptic number.

It is an amenable number.

61947421 is a deficient number, since it is larger than the sum of its proper divisors (119423).

61947421 is a wasteful number, since it uses less digits than its factorization.

61947421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119422.

The product of its digits is 12096, while the sum is 34.

The square root of 61947421 is about 7870.6683960131. The cubic root of 61947421 is about 395.6772465393.

The spelling of 61947421 in words is "sixty-one million, nine hundred forty-seven thousand, four hundred twenty-one".