61223157 has 6 divisors (see below), whose sum is σ = 88433462. Its totient is φ = 40815432.

The previous prime is 61223131. The next prime is 61223177. The reversal of 61223157 is 75132216.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 33281361 + 27941796 = 5769^2 + 5286^2 .

It is not a de Polignac number, because 61223157 - 2¹¹ = 61221109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61223157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61223117) 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, 3401278 + ... + 3401295.

Almost surely, 2^61223157 is an apocalyptic number.

It is an amenable number.

61223157 is a deficient number, since it is larger than the sum of its proper divisors (27210305).

61223157 is a wasteful number, since it uses less digits than its factorization.

61223157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6802579 (or 6802576 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 61223157 is about 7824.5227969506. The cubic root of 61223157 is about 394.1291652232.

The spelling of 61223157 in words is "sixty-one million, two hundred twenty-three thousand, one hundred fifty-seven".