61445737 has 2 divisors, whose sum is σ = 61445738. Its totient is φ = 61445736.

The previous prime is 61445729. The next prime is 61445749. The reversal of 61445737 is 73754416.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55666521 + 5779216 = 7461^2 + 2404^2 .

It is a cyclic number.

It is not a de Polignac number, because 61445737 - 2³ = 61445729 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 61445696 and 61445705.

It is not a weakly prime, because it can be changed into another prime (61445777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30722868 + 30722869.

It is an arithmetic number, because the mean of its divisors is an integer number (30722869).

Almost surely, 2^61445737 is an apocalyptic number.

It is an amenable number.

61445737 is a deficient number, since it is larger than the sum of its proper divisors (1).

61445737 is an equidigital number, since it uses as much as digits as its factorization.

61445737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70560, while the sum is 37.

The square root of 61445737 is about 7838.7331246828. The cubic root of 61445737 is about 394.6062133324.

It can be divided in two parts, 6144 and 5737, that added together give a square (11881 = 109²).

The spelling of 61445737 in words is "sixty-one million, four hundred forty-five thousand, seven hundred thirty-seven".