61972149 has 4 divisors (see below), whose sum is σ = 82629536. Its totient is φ = 41314764.

The previous prime is 61972147. The next prime is 61972171. The reversal of 61972149 is 94127916.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 61972149 - 2¹ = 61972147 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61972147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10328689 + ... + 10328694.

It is an arithmetic number, because the mean of its divisors is an integer number (20657384).

Almost surely, 2^61972149 is an apocalyptic number.

It is an amenable number.

61972149 is a deficient number, since it is larger than the sum of its proper divisors (20657387).

61972149 is a wasteful number, since it uses less digits than its factorization.

61972149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20657386.

The product of its digits is 27216, while the sum is 39.

The square root of 61972149 is about 7872.2391350873. The cubic root of 61972149 is about 395.7298879847.

The spelling of 61972149 in words is "sixty-one million, nine hundred seventy-two thousand, one hundred forty-nine".