72121787 has 2 divisors, whose sum is σ = 72121788. Its totient is φ = 72121786.

The previous prime is 72121757. The next prime is 72121801. The reversal of 72121787 is 78712127.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72121787 - 2¹² = 72117691 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72121757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36060893 + 36060894.

It is an arithmetic number, because the mean of its divisors is an integer number (36060894).

Almost surely, 2^72121787 is an apocalyptic number.

72121787 is a deficient number, since it is larger than the sum of its proper divisors (1).

72121787 is an equidigital number, since it uses as much as digits as its factorization.

72121787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10976, while the sum is 35.

The square root of 72121787 is about 8492.4547099175. The cubic root of 72121787 is about 416.2511946747.

The spelling of 72121787 in words is "seventy-two million, one hundred twenty-one thousand, seven hundred eighty-seven".