61421237 has 2 divisors, whose sum is σ = 61421238. Its totient is φ = 61421236.

The previous prime is 61421219. The next prime is 61421267. The reversal of 61421237 is 73212416.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34939921 + 26481316 = 5911^2 + 5146^2 .

It is a cyclic number.

It is not a de Polignac number, because 61421237 - 2⁸ = 61420981 is a prime.

It is a super-2 number, since 2×61421237² = 7545136709220338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61421267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30710618 + 30710619.

It is an arithmetic number, because the mean of its divisors is an integer number (30710619).

Almost surely, 2^61421237 is an apocalyptic number.

It is an amenable number.

61421237 is a deficient number, since it is larger than the sum of its proper divisors (1).

61421237 is an equidigital number, since it uses as much as digits as its factorization.

61421237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 26.

The square root of 61421237 is about 7837.1702163472. The cubic root of 61421237 is about 394.5537598022.

The spelling of 61421237 in words is "sixty-one million, four hundred twenty-one thousand, two hundred thirty-seven".