61501457 has 2 divisors, whose sum is σ = 61501458. Its totient is φ = 61501456.

The previous prime is 61501417. The next prime is 61501463. The reversal of 61501457 is 75410516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41422096 + 20079361 = 6436^2 + 4481^2 .

It is a cyclic number.

It is not a de Polignac number, because 61501457 - 2¹² = 61497361 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61501417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30750728 + 30750729.

It is an arithmetic number, because the mean of its divisors is an integer number (30750729).

Almost surely, 2^61501457 is an apocalyptic number.

It is an amenable number.

61501457 is a deficient number, since it is larger than the sum of its proper divisors (1).

61501457 is an equidigital number, since it uses as much as digits as its factorization.

61501457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 61501457 is about 7842.2864650560. The cubic root of 61501457 is about 394.7254557536.

The spelling of 61501457 in words is "sixty-one million, five hundred one thousand, four hundred fifty-seven".