61457749 has 2 divisors, whose sum is σ = 61457750. Its totient is φ = 61457748.

The previous prime is 61457743. The next prime is 61457801. The reversal of 61457749 is 94775416.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37271025 + 24186724 = 6105^2 + 4918^2 .

It is a cyclic number.

It is not a de Polignac number, because 61457749 - 2²³ = 53069141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61457743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30728874 + 30728875.

It is an arithmetic number, because the mean of its divisors is an integer number (30728875).

Almost surely, 2^61457749 is an apocalyptic number.

It is an amenable number.

61457749 is a deficient number, since it is larger than the sum of its proper divisors (1).

61457749 is an equidigital number, since it uses as much as digits as its factorization.

61457749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 43.

The square root of 61457749 is about 7839.4992824797. The cubic root of 61457749 is about 394.6319254551.

The spelling of 61457749 in words is "sixty-one million, four hundred fifty-seven thousand, seven hundred forty-nine".