61503149 has 2 divisors, whose sum is σ = 61503150. Its totient is φ = 61503148.

The previous prime is 61503131. The next prime is 61503181. The reversal of 61503149 is 94130516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44222500 + 17280649 = 6650^2 + 4157^2 .

It is a cyclic number.

It is not a de Polignac number, because 61503149 - 2¹⁶ = 61437613 is a prime.

It is a Chen prime.

It is a zygodrome in base 5.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61503109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30751574 + 30751575.

It is an arithmetic number, because the mean of its divisors is an integer number (30751575).

Almost surely, 2^61503149 is an apocalyptic number.

It is an amenable number.

61503149 is a deficient number, since it is larger than the sum of its proper divisors (1).

61503149 is an equidigital number, since it uses as much as digits as its factorization.

61503149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 61503149 is about 7842.3943410160. The cubic root of 61503149 is about 394.7290755559.

The spelling of 61503149 in words is "sixty-one million, five hundred three thousand, one hundred forty-nine".