61448021 has 2 divisors, whose sum is σ = 61448022. Its totient is φ = 61448020.

The previous prime is 61447949. The next prime is 61448029. The reversal of 61448021 is 12084416.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57547396 + 3900625 = 7586^2 + 1975^2 .

It is a cyclic number.

It is not a de Polignac number, because 61448021 - 2²² = 57253717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61448029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30724010 + 30724011.

It is an arithmetic number, because the mean of its divisors is an integer number (30724011).

Almost surely, 2^61448021 is an apocalyptic number.

It is an amenable number.

61448021 is a deficient number, since it is larger than the sum of its proper divisors (1).

61448021 is an equidigital number, since it uses as much as digits as its factorization.

61448021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 61448021 is about 7838.8788101361. The cubic root of 61448021 is about 394.6111025754.

The spelling of 61448021 in words is "sixty-one million, four hundred forty-eight thousand, twenty-one".