61221847 has 2 divisors, whose sum is σ = 61221848. Its totient is φ = 61221846.

The previous prime is 61221833. The next prime is 61221851. The reversal of 61221847 is 74812216.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61221847 - 2¹¹ = 61219799 is a prime.

It is a super-2 number, since 2×61221847² = 7496229100182818, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61221817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30610923 + 30610924.

It is an arithmetic number, because the mean of its divisors is an integer number (30610924).

Almost surely, 2^61221847 is an apocalyptic number.

61221847 is a deficient number, since it is larger than the sum of its proper divisors (1).

61221847 is an equidigital number, since it uses as much as digits as its factorization.

61221847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 31.

The square root of 61221847 is about 7824.4390853275. The cubic root of 61221847 is about 394.1263541252.

The spelling of 61221847 in words is "sixty-one million, two hundred twenty-one thousand, eight hundred forty-seven".