72430961 has 2 divisors, whose sum is σ = 72430962. Its totient is φ = 72430960.

The previous prime is 72430957. The next prime is 72430987. The reversal of 72430961 is 16903427.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69822736 + 2608225 = 8356^2 + 1615^2 .

It is an emirp because it is prime and its reverse (16903427) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72430961 - 2² = 72430957 is a prime.

It is a super-2 number, since 2×72430961² = 10492488222767042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72430921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36215480 + 36215481.

It is an arithmetic number, because the mean of its divisors is an integer number (36215481).

Almost surely, 2^72430961 is an apocalyptic number.

It is an amenable number.

72430961 is a deficient number, since it is larger than the sum of its proper divisors (1).

72430961 is an equidigital number, since it uses as much as digits as its factorization.

72430961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 72430961 is about 8510.6381076862. The cubic root of 72430961 is about 416.8451464348.

The spelling of 72430961 in words is "seventy-two million, four hundred thirty thousand, nine hundred sixty-one".