71121949 has 4 divisors (see below), whose sum is σ = 73574460. Its totient is φ = 68669440.

The previous prime is 71121901. The next prime is 71121961. The reversal of 71121949 is 94912117.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94912117 = 3413 ⋅27809.

It can be written as a sum of positive squares in 2 ways, for example, as 14976900 + 56145049 = 3870^2 + 7493^2 .

It is a cyclic number.

It is not a de Polignac number, because 71121949 - 2¹⁵ = 71089181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71121979) 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, 1226212 + ... + 1226269.

It is an arithmetic number, because the mean of its divisors is an integer number (18393615).

Almost surely, 2^71121949 is an apocalyptic number.

It is an amenable number.

71121949 is a deficient number, since it is larger than the sum of its proper divisors (2452511).

71121949 is a wasteful number, since it uses less digits than its factorization.

71121949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2452510.

The product of its digits is 4536, while the sum is 34.

The square root of 71121949 is about 8433.3830103939. The cubic root of 71121949 is about 414.3187137917.

The spelling of 71121949 in words is "seventy-one million, one hundred twenty-one thousand, nine hundred forty-nine".