61438757 has 2 divisors, whose sum is σ = 61438758. Its totient is φ = 61438756.

The previous prime is 61438739. The next prime is 61438763. The reversal of 61438757 is 75783416.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30813601 + 30625156 = 5551^2 + 5534^2 .

It is a cyclic number.

It is not a de Polignac number, because 61438757 - 2⁶ = 61438693 is a prime.

It is a super-3 number, since 3×61438757³ (a number of 24 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61438717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30719378 + 30719379.

It is an arithmetic number, because the mean of its divisors is an integer number (30719379).

Almost surely, 2^61438757 is an apocalyptic number.

It is an amenable number.

61438757 is a deficient number, since it is larger than the sum of its proper divisors (1).

61438757 is an equidigital number, since it uses as much as digits as its factorization.

61438757 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 41.

The square root of 61438757 is about 7838.2878870325. The cubic root of 61438757 is about 394.5912708492.

The spelling of 61438757 in words is "sixty-one million, four hundred thirty-eight thousand, seven hundred fifty-seven".