61649253 has 6 divisors (see below), whose sum is σ = 89048934. Its totient is φ = 41099496.

The previous prime is 61649249. The next prime is 61649257. The reversal of 61649253 is 35294616.

It is a happy number.

61649253 is a `hidden beast` number, since 6 + 1 + 649 + 2 + 5 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (61649249) and next prime (61649257).

It can be written as a sum of positive squares in only one way, i.e., 59954049 + 1695204 = 7743^2 + 1302^2 .

It is not a de Polignac number, because 61649253 - 2² = 61649249 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61649257) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3424950 + ... + 3424967.

It is an arithmetic number, because the mean of its divisors is an integer number (14841489).

Almost surely, 2^61649253 is an apocalyptic number.

It is an amenable number.

61649253 is a deficient number, since it is larger than the sum of its proper divisors (27399681).

61649253 is a wasteful number, since it uses less digits than its factorization.

61649253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6849923 (or 6849920 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 61649253 is about 7851.7038278325. The cubic root of 61649253 is about 395.0413950102.

The spelling of 61649253 in words is "sixty-one million, six hundred forty-nine thousand, two hundred fifty-three".