212901551 has 2 divisors, whose sum is σ = 212901552. Its totient is φ = 212901550.

The previous prime is 212901541. The next prime is 212901571. The reversal of 212901551 is 155109212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212901551 - 2⁶ = 212901487 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212901551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212901511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106450775 + 106450776.

It is an arithmetic number, because the mean of its divisors is an integer number (106450776).

Almost surely, 2^212901551 is an apocalyptic number.

212901551 is a deficient number, since it is larger than the sum of its proper divisors (1).

212901551 is an equidigital number, since it uses as much as digits as its factorization.

212901551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 212901551 is about 14591.1463223422. The cubic root of 212901551 is about 597.1172373891.

The spelling of 212901551 in words is "two hundred twelve million, nine hundred one thousand, five hundred fifty-one".