70723121 has 12 divisors (see below), whose sum is σ = 84925440. Its totient is φ = 58663080.

The previous prime is 70723117. The next prime is 70723127. The reversal of 70723121 is 12132707.

It is not a de Polignac number, because 70723121 - 2² = 70723117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70723127) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21761 + ... + 24798.

It is an arithmetic number, because the mean of its divisors is an integer number (7077120).

Almost surely, 2^70723121 is an apocalyptic number.

It is an amenable number.

70723121 is a deficient number, since it is larger than the sum of its proper divisors (14202319).

70723121 is a wasteful number, since it uses less digits than its factorization.

70723121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46604 (or 46597 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 70723121 is about 8409.7039781433. The cubic root of 70723121 is about 413.5428082479.

Adding to 70723121 its reverse (12132707), we get a palindrome (82855828).

The spelling of 70723121 in words is "seventy million, seven hundred twenty-three thousand, one hundred twenty-one".